Prototype Portal
Dross Scorpion
Altar of Dementia
Cathodion

   Prerequisites

What do I need to start this combo?
All permanents on the battlefield.
3 available

   Steps

How does this combo work?
1
Activate Prototype Portal by paying 3 and tapping it, creating a token copy of Cathodion.
2
Activate Altar of Dementia by sacrificing Cathodion.
3
When Cathodion dies, Cathodion and Dross Scorpion trigger.
4
Resolve the Cathodion trigger, adding .
5
Resolve the Dross Scorpion trigger, untapping Prototype Portal.
6
Resolve the Altar of Dementia ability, milling target player a number of cards equal to the sacrificed creature's power.
7
Repeat.

   Results

What do I get from this combo?
Infinite LTB
Infinite ETB
Infinite sacrifice triggers
Infinite death triggers
Infinite mill
Infinite self-mill
Weatherlight Compleated
0.7%inclusion2 decks281 decks
Atogatog
0.1%inclusion1 decks1.75K decks
Lulu, Loyal Hollyphant // Clan Crafter
1.5%inclusion1 decks68 decks
Traxos, Scourge of Kroog
0.1%inclusion1 decks1.96K decks
Karn, Silver Golem
0.1%inclusion1 decks1.05K decks
Teshar, Ancestor's Apostle
0.1%inclusion1 decks1.68K decks
The Master, Transcendent
0.0%inclusion1 decks4.43K decks
High Synergy Cards
Krark-Clan Ironworks
88%inclusion7 decks8 decks
86%synergy
Darksteel Citadel
88%inclusion7 decks8 decks
84%synergy
Ashnod's Altar
88%inclusion7 decks8 decks
81%synergy
Clock of Omens
75%inclusion6 decks8 decks
74%synergy
Myr Battlesphere
75%inclusion6 decks8 decks
73%synergy
Scrap Trawler
75%inclusion6 decks8 decks
73%synergy
Foundry Inspector
75%inclusion6 decks8 decks
71%synergy
Myr Moonvessel
63%inclusion5 decks8 decks
62%synergy
Workshop Assistant
63%inclusion5 decks8 decks
62%synergy
Blasting Station
63%inclusion5 decks8 decks
62%synergy
Top Cards
Nim Deathmantle
63%inclusion5 decks8 decks
62%synergy
Grinding Station
63%inclusion5 decks8 decks
62%synergy
Junk Diver
63%inclusion5 decks8 decks
62%synergy
Myr Retriever
63%inclusion5 decks8 decks
61%synergy
Salvaging Station
50%inclusion4 decks8 decks
50%synergy
Deathrender
50%inclusion4 decks8 decks
50%synergy
Su-Chi Cave Guard
50%inclusion4 decks8 decks
50%synergy
Myr Turbine
50%inclusion4 decks8 decks
50%synergy
Mycosynth Golem
50%inclusion4 decks8 decks
50%synergy
Jhoira's Familiar
50%inclusion4 decks8 decks
48%synergy
Game Changers
Cyclonic Rift
33%inclusion1 decks3 decks
10%synergy
Mana Vault
13%inclusion1 decks8 decks
7%synergy
The One Ring
13%inclusion1 decks8 decks
4%synergy
Ancient Tomb
13%inclusion1 decks8 decks
3%synergy
Creatures
Weapons Trainer
100%inclusion1 decks1 decks
100%synergy
Megatog
100%inclusion1 decks1 decks
100%synergy
Sarcatog
100%inclusion1 decks1 decks
100%synergy
Atog
100%inclusion1 decks1 decks
100%synergy
Lithatog
100%inclusion1 decks1 decks
100%synergy
Jenny Flint
100%inclusion1 decks1 decks
100%synergy
Thaumatog
100%inclusion1 decks1 decks
100%synergy
Skittering Precursor
100%inclusion1 decks1 decks
100%synergy
Mazzy, Truesword Paladin
100%inclusion1 decks1 decks
100%synergy
Krenko, Baron of Tin Street
100%inclusion1 decks1 decks
100%synergy
Optimus Prime, Hero
100%inclusion1 decks1 decks
99%synergy
Judith, the Scourge Diva
100%inclusion1 decks1 decks
99%synergy
Cadric, Soul Kindler
100%inclusion1 decks1 decks
98%synergy
Crime Novelist
100%inclusion1 decks1 decks
98%synergy
Etherium Sculptor
67%inclusion2 decks3 decks
61%synergy
Ethersworn Shieldmage
50%inclusion1 decks2 decks
50%synergy
Psychatog
50%inclusion1 decks2 decks
50%synergy
Ambush Commander
50%inclusion1 decks2 decks
50%synergy
Volrath, the Shapestealer
50%inclusion1 decks2 decks
50%synergy
Silas Renn, Seeker Adept
50%inclusion1 decks2 decks
50%synergy
Lonis, Genetics Expert
50%inclusion1 decks2 decks
50%synergy
Imotekh the Stormlord
50%inclusion1 decks2 decks
49%synergy
Elder Owyn Lyons
50%inclusion1 decks2 decks
49%synergy
Transit Mage
50%inclusion1 decks2 decks
49%synergy
Necron Deathmark
50%inclusion1 decks2 decks
49%synergy
Tormod, the Desecrator
50%inclusion1 decks2 decks
49%synergy
Moritte of the Frost
50%inclusion1 decks2 decks
49%synergy
Yedora, Grave Gardener
50%inclusion1 decks2 decks
49%synergy
Wurmcoil Engine
50%inclusion4 decks8 decks
48%synergy
Mendicant Core, Guidelight
50%inclusion1 decks2 decks
48%synergy
Devoted Druid
50%inclusion1 decks2 decks
47%synergy
Aftermath Analyst
50%inclusion1 decks2 decks
46%synergy
Sanctum Weaver
50%inclusion1 decks2 decks
45%synergy
Solemn Simulacrum
50%inclusion4 decks8 decks
37%synergy
Baleful Strix
50%inclusion1 decks2 decks
37%synergy
Extruder
38%inclusion3 decks8 decks
37%synergy
Pentavus
38%inclusion3 decks8 decks
37%synergy
Arcbound Ravager
38%inclusion3 decks8 decks
37%synergy
Glaring Fleshraker
38%inclusion3 decks8 decks
36%synergy
Walking Ballista
38%inclusion3 decks8 decks
35%synergy
Chronatog
33%inclusion1 decks3 decks
33%synergy
Trusty Packbeast
33%inclusion1 decks3 decks
33%synergy
Ruination Guide
33%inclusion1 decks3 decks
33%synergy
Fairgrounds Warden
33%inclusion1 decks3 decks
33%synergy
Auratog
33%inclusion1 decks3 decks
33%synergy
Nardole, Resourceful Cyborg
33%inclusion1 decks3 decks
33%synergy
Malcator's Watcher
33%inclusion1 decks3 decks
33%synergy
Dauntless Bodyguard
33%inclusion1 decks3 decks
33%synergy
Curie, Emergent Intelligence
33%inclusion1 decks3 decks
33%synergy
Market Gnome
33%inclusion1 decks3 decks
33%synergy
Instants
Generous Gift
67%inclusion2 decks3 decks
44%synergy
Double Major
50%inclusion1 decks2 decks
47%synergy
Patrician's Scorn
33%inclusion1 decks3 decks
33%synergy
Second Sunrise
33%inclusion1 decks3 decks
33%synergy
Faith's Reward
33%inclusion1 decks3 decks
33%synergy
Mana Tithe
33%inclusion1 decks3 decks
32%synergy
Disallow
33%inclusion1 decks3 decks
32%synergy
Sink into Stupor
33%inclusion1 decks3 decks
23%synergy
Mana Drain
33%inclusion1 decks3 decks
19%synergy
Counterspell
33%inclusion1 decks3 decks
-9%synergy
Swords to Plowshares
33%inclusion1 decks3 decks
-28%synergy
Warping Wail
25%inclusion2 decks8 decks
24%synergy
Scour from Existence
13%inclusion1 decks8 decks
12%synergy
Eldrazi Confluence
13%inclusion1 decks8 decks
12%synergy
Kozilek's Command
13%inclusion1 decks8 decks
12%synergy
Eldritch Immunity
13%inclusion1 decks8 decks
12%synergy
Null Elemental Blast
13%inclusion1 decks8 decks
11%synergy
Sorceries
Citywide Bust
33%inclusion1 decks3 decks
33%synergy
Hour of Revelation
33%inclusion1 decks3 decks
32%synergy
Open the Vaults
33%inclusion1 decks3 decks
32%synergy
Day of Judgment
33%inclusion1 decks3 decks
32%synergy
Organic Extinction
33%inclusion1 decks3 decks
31%synergy
Irenicus's Vile Duplication
33%inclusion1 decks3 decks
30%synergy
All Is Dust
25%inclusion2 decks8 decks
23%synergy
Introduction to Annihilation
13%inclusion1 decks8 decks
12%synergy
Utility Artifacts
Skeleton Shard
50%inclusion1 decks2 decks
50%synergy
Bootleggers' Stash
50%inclusion1 decks2 decks
48%synergy
Time Sieve
50%inclusion1 decks2 decks
47%synergy
Wishclaw Talisman
50%inclusion1 decks2 decks
45%synergy
Summoning Station
38%inclusion3 decks8 decks
37%synergy
Retrofitter Foundry
38%inclusion3 decks8 decks
37%synergy
Cauldron of Souls
38%inclusion3 decks8 decks
37%synergy
Semblance Anvil
38%inclusion3 decks8 decks
37%synergy
Mimic Vat
38%inclusion3 decks8 decks
37%synergy
Voltaic Key
38%inclusion3 decks8 decks
37%synergy
Tarrian's Soulcleaver
38%inclusion3 decks8 decks
36%synergy
Forsaken Monument
38%inclusion3 decks8 decks
36%synergy
Cloud Key
38%inclusion3 decks8 decks
36%synergy
Sensei's Divining Top
38%inclusion3 decks8 decks
33%synergy
Origin Spellbomb
33%inclusion1 decks3 decks
33%synergy
Veil of Assimilation
33%inclusion1 decks3 decks
33%synergy
Basilica Skullbomb
33%inclusion1 decks3 decks
33%synergy
Esoteric Duplicator
33%inclusion1 decks3 decks
33%synergy
Folio of Fancies
33%inclusion1 decks3 decks
32%synergy
Chimeric Coils
25%inclusion2 decks8 decks
25%synergy
Flayer Husk
25%inclusion2 decks8 decks
25%synergy
Ring of Three Wishes
25%inclusion2 decks8 decks
25%synergy
Ugin's Nexus
25%inclusion2 decks8 decks
25%synergy
Grindstone
25%inclusion2 decks8 decks
25%synergy
Animation Module
25%inclusion2 decks8 decks
25%synergy
Throne of Geth
25%inclusion2 decks8 decks
25%synergy
Mirrorworks
25%inclusion2 decks8 decks
24%synergy
Codex Shredder
25%inclusion2 decks8 decks
24%synergy
Mycosynth Lattice
25%inclusion2 decks8 decks
24%synergy
Helm of Awakening
25%inclusion2 decks8 decks
24%synergy
Trading Post
25%inclusion2 decks8 decks
24%synergy
Contagion Engine
25%inclusion2 decks8 decks
24%synergy
Tormod's Crypt
25%inclusion2 decks8 decks
24%synergy
Altar of the Brood
25%inclusion2 decks8 decks
24%synergy
Nuka-Cola Vending Machine
25%inclusion2 decks8 decks
24%synergy
Rings of Brighthearth
25%inclusion2 decks8 decks
24%synergy
Staff of Domination
25%inclusion2 decks8 decks
24%synergy
Commander's Plate
25%inclusion2 decks8 decks
23%synergy
Unwinding Clock
25%inclusion2 decks8 decks
22%synergy
Mystic Forge
25%inclusion2 decks8 decks
22%synergy
Radiant Lotus
14%inclusion1 decks7 decks
14%synergy
Chimeric Idol
13%inclusion1 decks8 decks
12%synergy
Galvanic Key
13%inclusion1 decks8 decks
12%synergy
Sands of Delirium
13%inclusion1 decks8 decks
12%synergy
Karn's Sylex
13%inclusion1 decks8 decks
12%synergy
Orochi Hatchery
13%inclusion1 decks8 decks
12%synergy
Keening Stone
13%inclusion1 decks8 decks
12%synergy
Sword of the Meek
13%inclusion1 decks8 decks
12%synergy
Magistrate's Scepter
13%inclusion1 decks8 decks
12%synergy
Dino DNA
13%inclusion1 decks8 decks
12%synergy
Enchantments
Nahiri's Resolve
100%inclusion1 decks1 decks
99%synergy
Mayael's Aria
100%inclusion1 decks1 decks
98%synergy
Enduring Renewal
67%inclusion2 decks3 decks
67%synergy
Raiders' Spoils
50%inclusion1 decks2 decks
50%synergy
Harald Unites the Elves
50%inclusion1 decks2 decks
50%synergy
Nature's Chosen
50%inclusion1 decks2 decks
50%synergy
Instill Energy
50%inclusion1 decks2 decks
49%synergy
Biotransference
50%inclusion1 decks2 decks
49%synergy
Fanatical Devotion
33%inclusion1 decks3 decks
33%synergy
Ossification
33%inclusion1 decks3 decks
32%synergy
Mirrodin Besieged
33%inclusion1 decks3 decks
32%synergy
Dollmaker's Shop // Porcelain Gallery
33%inclusion1 decks3 decks
32%synergy
Planeswalkers
Domri, Anarch of Bolas
100%inclusion1 decks1 decks
97%synergy
Karn, the Great Creator
25%inclusion2 decks8 decks
24%synergy
Ugin, the Ineffable
25%inclusion2 decks8 decks
23%synergy
Tezzeret, Cruel Captain
20%inclusion1 decks5 decks
18%synergy
Ugin, the Spirit Dragon
13%inclusion1 decks8 decks
11%synergy
Utility Lands
Ancient Den
67%inclusion2 decks3 decks
61%synergy
Seat of the Synod
67%inclusion2 decks3 decks
60%synergy
Buried Ruin
63%inclusion5 decks8 decks
58%synergy
Shrine of the Forsaken Gods
50%inclusion4 decks8 decks
49%synergy
Urza's Power Plant
50%inclusion4 decks8 decks
48%synergy
Urza's Mine
50%inclusion4 decks8 decks
48%synergy
Urza's Tower
50%inclusion4 decks8 decks
48%synergy
Tree of Tales
50%inclusion1 decks2 decks
48%synergy
Uthros, Titanic Godcore
50%inclusion1 decks2 decks
47%synergy
Inventors' Fair
50%inclusion4 decks8 decks
46%synergy
Vault of Whispers
50%inclusion1 decks2 decks
46%synergy
War Room
50%inclusion4 decks8 decks
44%synergy
Rogue's Passage
50%inclusion4 decks8 decks
30%synergy
Reliquary Tower
50%inclusion4 decks8 decks
20%synergy
Zhalfirin Void
38%inclusion3 decks8 decks
37%synergy
Urza's Workshop
38%inclusion3 decks8 decks
37%synergy
Treasure Vault
38%inclusion3 decks8 decks
35%synergy
Magosi, the Waterveil
33%inclusion1 decks3 decks
33%synergy
Secluded Starforge
33%inclusion1 decks3 decks
33%synergy
Drifting Meadow
33%inclusion1 decks3 decks
33%synergy
Archway of Innovation
33%inclusion1 decks3 decks
30%synergy
Castle Vantress
33%inclusion1 decks3 decks
30%synergy
Rivendell
33%inclusion1 decks3 decks
30%synergy
Castle Ardenvale
33%inclusion1 decks3 decks
29%synergy
Minamo, School at Water's Edge
33%inclusion1 decks3 decks
29%synergy
Minas Tirith
33%inclusion1 decks3 decks
27%synergy
Sequestered Stash
25%inclusion2 decks8 decks
25%synergy
Blasted Landscape
25%inclusion2 decks8 decks
25%synergy
Urza's Factory
25%inclusion2 decks8 decks
25%synergy
Labyrinth of Skophos
25%inclusion2 decks8 decks
25%synergy
Mishra's Factory
25%inclusion2 decks8 decks
24%synergy
Crystal Vein
25%inclusion2 decks8 decks
24%synergy
Tomb of the Spirit Dragon
25%inclusion2 decks8 decks
24%synergy
Blast Zone
25%inclusion2 decks8 decks
24%synergy
Guildless Commons
25%inclusion2 decks8 decks
24%synergy
Arcane Lighthouse
25%inclusion2 decks8 decks
24%synergy
Homeward Path
25%inclusion2 decks8 decks
24%synergy
Emergence Zone
25%inclusion2 decks8 decks
23%synergy
Bonders' Enclave
25%inclusion2 decks8 decks
23%synergy
Karn's Bastion
25%inclusion2 decks8 decks
20%synergy
Blinkmoth Well
13%inclusion1 decks8 decks
12%synergy
Tower of the Magistrate
13%inclusion1 decks8 decks
12%synergy
Encroaching Wastes
13%inclusion1 decks8 decks
12%synergy
Nephalia Academy
13%inclusion1 decks8 decks
12%synergy
Petrified Field
13%inclusion1 decks8 decks
12%synergy
Haunted Fengraf
13%inclusion1 decks8 decks
12%synergy
Mystifying Maze
13%inclusion1 decks8 decks
12%synergy
Phyrexia's Core
13%inclusion1 decks8 decks
12%synergy
Ruins of Oran-Rief
13%inclusion1 decks8 decks
12%synergy
Ominous Cemetery
13%inclusion1 decks8 decks
12%synergy
Mana Artifacts
Sol Ring
88%inclusion7 decks8 decks
4%synergy
Simic Cluestone
50%inclusion1 decks2 decks
50%synergy
Golgari Cluestone
50%inclusion1 decks2 decks
50%synergy
Dimir Cluestone
50%inclusion1 decks2 decks
50%synergy
Golgari Signet
50%inclusion1 decks2 decks
39%synergy
Simic Signet
50%inclusion1 decks2 decks
38%synergy
Azorius Signet
50%inclusion1 decks2 decks
28%synergy
Talisman of Progress
50%inclusion1 decks2 decks
25%synergy
Dimir Signet
50%inclusion1 decks2 decks
24%synergy
Basalt Monolith
38%inclusion3 decks8 decks
35%synergy
Everflowing Chalice
38%inclusion3 decks8 decks
33%synergy
Thran Dynamo
38%inclusion3 decks8 decks
33%synergy
Lotus Petal
38%inclusion3 decks8 decks
30%synergy
Mind Stone
38%inclusion3 decks8 decks
22%synergy
Thought Vessel
38%inclusion3 decks8 decks
20%synergy
Crystal Skull, Isu Spyglass
33%inclusion1 decks3 decks
31%synergy
Marble Diamond
33%inclusion1 decks3 decks
30%synergy
Midnight Clock
33%inclusion1 decks3 decks
28%synergy
Gilded Lotus
25%inclusion2 decks8 decks
22%synergy
Arcane Signet
25%inclusion2 decks8 decks
-47%synergy
Prophetic Prism
13%inclusion1 decks8 decks
12%synergy
Chromatic Star
13%inclusion1 decks8 decks
12%synergy
The Mightstone and Weakstone
13%inclusion1 decks8 decks
12%synergy
Paradise Mantle
13%inclusion1 decks8 decks
12%synergy
Dreamstone Hedron
13%inclusion1 decks8 decks
12%synergy
Chromatic Orrery
13%inclusion1 decks8 decks
11%synergy
Hedron Archive
13%inclusion1 decks8 decks
10%synergy
Decanter of Endless Water
13%inclusion1 decks8 decks
8%synergy
Mox Opal
13%inclusion1 decks8 decks
8%synergy
Mox Amber
13%inclusion1 decks8 decks
8%synergy
Commander's Sphere
13%inclusion1 decks8 decks
0%synergy
Lands
Cliffgate
100%inclusion1 decks1 decks
99%synergy
Crystal Quarry
100%inclusion1 decks1 decks
96%synergy
Xander's Lounge
100%inclusion1 decks1 decks
76%synergy
Savai Triome
100%inclusion1 decks1 decks
75%synergy
Ziatora's Proving Ground
100%inclusion1 decks1 decks
72%synergy
Indatha Triome
100%inclusion1 decks1 decks
72%synergy
Spara's Headquarters
100%inclusion1 decks1 decks
72%synergy
The World Tree
100%inclusion1 decks1 decks
71%synergy
Ketria Triome
100%inclusion1 decks1 decks
69%synergy
Steam Vents
100%inclusion1 decks1 decks
62%synergy
Hallowed Fountain
100%inclusion2 decks2 decks
60%synergy
Black Dragon Gate
50%inclusion1 decks2 decks
48%synergy
Manor Gate
50%inclusion1 decks2 decks
48%synergy
Razortide Bridge
50%inclusion1 decks2 decks
43%synergy
Meticulous Archive
50%inclusion1 decks2 decks
42%synergy
Deserted Beach
50%inclusion1 decks2 decks
33%synergy
Undergrowth Stadium
50%inclusion1 decks2 decks
26%synergy
Morphic Pool
50%inclusion1 decks2 decks
25%synergy
Sea of Clouds
50%inclusion1 decks2 decks
25%synergy
Zagoth Triome
50%inclusion1 decks2 decks
22%synergy
Glacial Fortress
50%inclusion1 decks2 decks
18%synergy
Overgrown Tomb
50%inclusion1 decks2 decks
10%synergy
Watery Grave
50%inclusion1 decks2 decks
9%synergy
Breeding Pool
50%inclusion1 decks2 decks
9%synergy
Citadel Gate
33%inclusion1 decks3 decks
32%synergy
Sea Gate
33%inclusion1 decks3 decks
32%synergy
Power Depot
25%inclusion2 decks8 decks
24%synergy
Arid Mesa
25%inclusion2 decks8 decks
15%synergy
Scalding Tarn
25%inclusion2 decks8 decks
14%synergy
Verdant Catacombs
25%inclusion2 decks8 decks
14%synergy
Misty Rainforest
25%inclusion2 decks8 decks
13%synergy
Polluted Delta
25%inclusion2 decks8 decks
13%synergy
Command Tower
25%inclusion2 decks8 decks
-49%synergy
Hall of Tagsin
13%inclusion1 decks8 decks
12%synergy
Heap Gate
13%inclusion1 decks8 decks
12%synergy
Scene of the Crime
13%inclusion1 decks8 decks
12%synergy
Gond Gate
13%inclusion1 decks8 decks
12%synergy
The Mycosynth Gardens
13%inclusion1 decks8 decks
11%synergy
Forbidden Orchard
13%inclusion1 decks8 decks
10%synergy
Plaza of Heroes
13%inclusion1 decks8 decks
10%synergy
Demolition Field
13%inclusion1 decks8 decks
9%synergy
Spire of Industry
13%inclusion1 decks8 decks
9%synergy
Mana Confluence
13%inclusion1 decks8 decks
5%synergy
City of Brass
13%inclusion1 decks8 decks
5%synergy
Fabled Passage
13%inclusion1 decks8 decks
3%synergy
Windswept Heath
13%inclusion1 decks8 decks
2%synergy
Flooded Strand
13%inclusion1 decks8 decks
1%synergy
Myriad Landscape
13%inclusion1 decks8 decks
-4%synergy
Path of Ancestry
13%inclusion1 decks8 decks
-9%synergy
Exotic Orchard
13%inclusion1 decks8 decks
-24%synergy