Yarus, Roar of the Old Gods
Karlov Watchdog
Altar of Dementia
Harmless Offering

   Prerequisites

What do I need to start this combo?
Harmless Offering in hand.
All other permanents on the battlefield.
You control a face-down creature whose front face is a permanent card. You have enough mana to cast Harmless Offering.

   Steps

How does this combo work?
1
Cast Harmless Offering by paying its mana cost, giving control of Karlov Watchdog to an opponent.
2
During the opponent's turn, activate Altar of Dementia by sacrificing a face-down creature you control.
3
When the creature dies, Yarus's second ability triggers, returning it from your graveyard to the battlefield face-down as a 2/2 creature, and then not turning it face-up due to Karlov Watchdog.
4
Resolve the Altar of Dementia ability.
5
Repeat from step 2.

   Results

What do I get from this combo?
Infinite LTB
Infinite ETB
Infinite sacrifice triggers
Infinite death triggers
Infinite mill
Infinite self-mill
Kaust, Eyes of the Glade
0.4%inclusion11 decks2.85K decks
Kenrith, the Returned King
0.0%inclusion2 decks29.5K decks
Rocco, Cabaretti Caterer
0.0%inclusion1 decks8.68K decks
Aragorn, the Uniter
0.0%inclusion1 decks21.1K decks
New Cards
Erode
50%inclusion1 decks2 decks
47%synergy
High Synergy Cards
Ashcloud Phoenix
80%inclusion12 decks15 decks
80%synergy
Scroll of Fate
80%inclusion12 decks15 decks
80%synergy
Den Protector
80%inclusion12 decks15 decks
79%synergy
Obscuring Aether
73%inclusion11 decks15 decks
73%synergy
Experiment Twelve
73%inclusion11 decks15 decks
73%synergy
Yedora, Grave Gardener
73%inclusion11 decks15 decks
72%synergy
Veiled Ascension
67%inclusion10 decks15 decks
67%synergy
Panoptic Projektor
67%inclusion10 decks15 decks
67%synergy
Curator Beastie
67%inclusion10 decks15 decks
66%synergy
Ainok Survivalist
67%inclusion10 decks15 decks
66%synergy
Top Cards
Trail of Mystery
67%inclusion10 decks15 decks
66%synergy
Threats Around Every Corner
67%inclusion10 decks15 decks
66%synergy
Path to Exile
67%inclusion10 decks15 decks
19%synergy
Hidden Dragonslayer
60%inclusion9 decks15 decks
60%synergy
Pyrotechnic Performer
60%inclusion9 decks15 decks
60%synergy
Ugin's Mastery
60%inclusion9 decks15 decks
60%synergy
Deathmist Raptor
60%inclusion9 decks15 decks
59%synergy
Hauntwoods Shrieker
60%inclusion9 decks15 decks
59%synergy
True Identity
53%inclusion8 decks15 decks
53%synergy
Mastery of the Unseen
53%inclusion8 decks15 decks
53%synergy
Game Changers
Seedborn Muse
27%inclusion4 decks15 decks
19%synergy
Farewell
20%inclusion3 decks15 decks
8%synergy
Creatures
Stiltzkin, Moogle Merchant
53%inclusion8 decks15 decks
53%synergy
Whisperwood Elemental
53%inclusion8 decks15 decks
53%synergy
Welcoming Vampire
53%inclusion8 decks15 decks
47%synergy
Boltbender
47%inclusion7 decks15 decks
46%synergy
Salt Road Ambushers
40%inclusion6 decks15 decks
40%synergy
Duskana, the Rage Mother
40%inclusion6 decks15 decks
40%synergy
Printlifter Ooze
40%inclusion6 decks15 decks
40%synergy
Nantuko Vigilante
40%inclusion6 decks15 decks
40%synergy
Akroma, Angel of Fury
40%inclusion6 decks15 decks
40%synergy
Overgrown Zealot
40%inclusion6 decks15 decks
39%synergy
Kozilek, the Broken Reality
40%inclusion6 decks15 decks
39%synergy
Ohran Frostfang
40%inclusion6 decks15 decks
34%synergy
Beast Whisperer
40%inclusion6 decks15 decks
30%synergy
Tin Street Gossip
33%inclusion5 decks15 decks
33%synergy
Fortune Thief
33%inclusion5 decks15 decks
33%synergy
Bazaar Trader
33%inclusion5 decks15 decks
33%synergy
Birds of Paradise
33%inclusion5 decks15 decks
6%synergy
Unyielding Gatekeeper
27%inclusion4 decks15 decks
27%synergy
Tunnel Tipster
27%inclusion4 decks15 decks
27%synergy
Aurelia's Vindicator
27%inclusion4 decks15 decks
27%synergy
Krosan Cloudscraper
27%inclusion4 decks15 decks
27%synergy
Essence of Antiquity
27%inclusion4 decks15 decks
26%synergy
Sakura-Tribe Elder
27%inclusion4 decks15 decks
11%synergy
Master of Pearls
20%inclusion3 decks15 decks
20%synergy
Sumala Sentry
20%inclusion3 decks15 decks
20%synergy
Cryptid Inspector
20%inclusion3 decks15 decks
20%synergy
Root Elemental
20%inclusion3 decks15 decks
20%synergy
Temur War Shaman
20%inclusion3 decks15 decks
20%synergy
Hooded Hydra
20%inclusion3 decks15 decks
19%synergy
Zirda, the Dawnwaker
20%inclusion3 decks15 decks
18%synergy
Delighted Halfling
20%inclusion3 decks15 decks
8%synergy
Instants
Break Down the Door
53%inclusion8 decks15 decks
53%synergy
Swords to Plowshares
53%inclusion8 decks15 decks
-8%synergy
Expose the Culprit
47%inclusion7 decks15 decks
47%synergy
Heroic Intervention
27%inclusion4 decks15 decks
-4%synergy
Return of the Wildspeaker
20%inclusion3 decks15 decks
9%synergy
Deflecting Swat
20%inclusion3 decks15 decks
3%synergy
Generous Gift
20%inclusion3 decks15 decks
-1%synergy
Beast Within
20%inclusion3 decks15 decks
-13%synergy
Sorceries
Under the Skin
53%inclusion8 decks15 decks
53%synergy
Nature's Lore
53%inclusion8 decks15 decks
22%synergy
Hide in Plain Sight
47%inclusion7 decks15 decks
46%synergy
Valgavoth's Onslaught
47%inclusion7 decks15 decks
46%synergy
Cultivate
47%inclusion7 decks15 decks
4%synergy
Manifest Dread
40%inclusion6 decks15 decks
40%synergy
Three Visits
33%inclusion5 decks15 decks
9%synergy
Kodama's Reach
33%inclusion5 decks15 decks
7%synergy
Farseek
33%inclusion5 decks15 decks
-2%synergy
Austere Command
27%inclusion4 decks15 decks
15%synergy
Soul Summons
20%inclusion3 decks15 decks
20%synergy
Rampant Growth
20%inclusion3 decks15 decks
-13%synergy
Utility Artifacts
Forsaken Monument
47%inclusion7 decks15 decks
45%synergy
Dream Chisel
40%inclusion6 decks15 decks
40%synergy
Ashnod's Altar
33%inclusion5 decks15 decks
27%synergy
Cybership
20%inclusion3 decks15 decks
20%synergy
Cloud Key
20%inclusion3 decks15 decks
18%synergy
Lifecrafter's Bestiary
20%inclusion3 decks15 decks
17%synergy
Swiftfoot Boots
20%inclusion3 decks15 decks
-7%synergy
Enchantments
Rhythm of the Wild
53%inclusion8 decks15 decks
32%synergy
Experimental Lab // Staff Room
47%inclusion7 decks15 decks
46%synergy
Goblin Bombardment
40%inclusion6 decks15 decks
34%synergy
Break Through the Line
20%inclusion3 decks15 decks
20%synergy
Elven Chorus
20%inclusion3 decks15 decks
17%synergy
Planeswalkers
Ugin, the Ineffable
47%inclusion7 decks15 decks
45%synergy
Utility Lands
Zoetic Cavern
47%inclusion7 decks15 decks
46%synergy
Branch of Vitu-Ghazi
47%inclusion7 decks15 decks
46%synergy
Kessig Wolf Run
27%inclusion4 decks15 decks
12%synergy
Reliquary Tower
27%inclusion4 decks15 decks
-3%synergy
Tomb of the Spirit Dragon
20%inclusion3 decks15 decks
19%synergy
Shrine of the Forsaken Gods
20%inclusion3 decks15 decks
19%synergy
Mana Artifacts
Sol Ring
87%inclusion13 decks15 decks
3%synergy
Arcane Signet
73%inclusion11 decks15 decks
1%synergy
Lands
Steam Vents
100%inclusion3 decks3 decks
61%synergy
Breeding Pool
100%inclusion3 decks3 decks
58%synergy
Command Tower
87%inclusion13 decks15 decks
12%synergy
Jungle Shrine
73%inclusion11 decks15 decks
42%synergy
Canopy Vista
53%inclusion8 decks15 decks
18%synergy
Exotic Orchard
53%inclusion8 decks15 decks
17%synergy
Temple of Plenty
47%inclusion7 decks15 decks
34%synergy
Sunpetal Grove
47%inclusion7 decks15 decks
18%synergy
Stomping Ground
47%inclusion7 decks15 decks
5%synergy
Temple of Abandon
40%inclusion6 decks15 decks
28%synergy
Fortified Village
40%inclusion6 decks15 decks
24%synergy
Temple of Triumph
40%inclusion6 decks15 decks
24%synergy
Cinder Glade
40%inclusion6 decks15 decks
2%synergy
Temple Garden
40%inclusion6 decks15 decks
1%synergy
Jetmir's Garden
33%inclusion5 decks15 decks
5%synergy
Rootbound Crag
33%inclusion5 decks15 decks
4%synergy
Scattered Groves
27%inclusion4 decks15 decks
19%synergy
Elegant Parlor
27%inclusion4 decks15 decks
19%synergy
Lush Portico
27%inclusion4 decks15 decks
18%synergy
Sheltered Thicket
27%inclusion4 decks15 decks
17%synergy
Arid Mesa
27%inclusion4 decks15 decks
17%synergy
Wooded Foothills
27%inclusion4 decks15 decks
16%synergy
Windswept Heath
27%inclusion4 decks15 decks
16%synergy
Furycalm Snarl
27%inclusion4 decks15 decks
13%synergy
Game Trail
27%inclusion4 decks15 decks
12%synergy
Overgrown Farmland
27%inclusion4 decks15 decks
9%synergy
Rockfall Vale
27%inclusion4 decks15 decks
6%synergy
Sacred Foundry
27%inclusion4 decks15 decks
-10%synergy
Commercial District
20%inclusion3 decks15 decks
10%synergy
Marsh Flats
20%inclusion3 decks15 decks
9%synergy
Scalding Tarn
20%inclusion3 decks15 decks
9%synergy
Verdant Catacombs
20%inclusion3 decks15 decks
9%synergy
Bloodstained Mire
20%inclusion3 decks15 decks
9%synergy
Misty Rainforest
20%inclusion3 decks15 decks
9%synergy
Flooded Strand
20%inclusion3 decks15 decks
9%synergy
Mossfire Valley
20%inclusion3 decks15 decks
8%synergy
Boros Garrison
20%inclusion3 decks15 decks
8%synergy
Sungrass Prairie
20%inclusion3 decks15 decks
7%synergy
Karplusan Forest
20%inclusion3 decks15 decks
0%synergy
Spire Garden
20%inclusion3 decks15 decks
-2%synergy
Clifftop Retreat
20%inclusion3 decks15 decks
-16%synergy