Splinter Twin + Devoted Druid + Cathars' Crusade

Splinter Twin
Devoted Druid
Cathars' Crusade

Requires
Splinter Twin must be on the battlefield. Devoted Druid must be on the battlefield. Cathars' Crusade must be on the battlefield.
Steps
  1. Activate Devoted Druid by tapping it, creating a token copy of it with haste.
  2. When the Devoted Druid token enters the battlefield, Cathars' Crusade triggers, putting a +1/+1 counter on each creature you control.
  3. Activate the nontoken Devoted Druid's second ability by putting a -1/-1 counter on it, untapping it.
  4. Repeat.
  5. Once you have infinite Devoted Druid tokens, you may tap them to get infinite .
Results
Infinite creature tokens with haste. Infinite ETB. Infinite green mana. Infinite +1/+1 counters.

Ghired, Mirror of the Wilds
0.10% of 3115 decks 3 decks
Rocco, Cabaretti Caterer
0.03% of 6417 decks 2 decks
Marath, Will of the Wild
0.08% of 2606 decks 2 decks
Jegantha, the Wellspring
0.07% of 1451 decks 1 decks
Baylen, the Haymaker
0.01% of 13930 decks 1 decks
Marisi, Breaker of the Coil
0.02% of 4396 decks 1 decks
Shalai and Hallar
0.01% of 10670 decks 1 decks
Kenrith, the Returned King
0.00% of 23680 decks 1 decks
Jinnie Fay, Jetmir's Second
0.02% of 5392 decks 1 decks
High Synergy Cards
Midnight Guard
77% of 13 decks +77% synergy
Herd Baloth
77% of 13 decks +76% synergy
Ivy Lane Denizen
77% of 13 decks +75% synergy
Scurry Oak
77% of 13 decks +75% synergy
Presence of Gond
69% of 13 decks +69% synergy
Elemental Mastery
62% of 13 decks +61% synergy
Heliod, Sun-Crowned
54% of 13 decks +51% synergy
Sunstrike Legionnaire
46% of 13 decks +46% synergy
Impact Tremors
54% of 13 decks +44% synergy
Rosie Cotton of South Lane
46% of 13 decks +43% synergy
Top Cards
Birds of Paradise
54% of 13 decks +27% synergy
Kiki-Jiki, Mirror Breaker
46% of 13 decks +43% synergy
Swords to Plowshares
46% of 13 decks -16% synergy
Purphoros, God of the Forge
38% of 13 decks +34% synergy
Llanowar Elves
38% of 13 decks +18% synergy
Earthcraft
31% of 13 decks +30% synergy
Umbral Mantle
31% of 13 decks +30% synergy
Village Bell-Ringer
31% of 13 decks +30% synergy
Goblin Bombardment
31% of 13 decks +25% synergy
Champion of Lambholt
31% of 13 decks +24% synergy
Game Changers
Enlightened Tutor
31% of 13 decks +14% synergy
Creatures
Avacyn's Pilgrim
31% of 13 decks +17% synergy
Elvish Mystic
31% of 13 decks +13% synergy
Esper Sentinel
31% of 13 decks +11% synergy
Vizier of Remedies
23% of 13 decks +23% synergy
Triskelion
23% of 13 decks +23% synergy
Hyrax Tower Scout
23% of 13 decks +23% synergy
Zealous Conscripts
23% of 13 decks +21% synergy
Krenko, Mob Boss
23% of 13 decks +21% synergy
Magda, Brazen Outlaw
23% of 13 decks +21% synergy
Felidar Guardian
23% of 13 decks +21% synergy
Walking Ballista
23% of 13 decks +21% synergy
Restoration Angel
23% of 13 decks +21% synergy
Prosperous Innkeeper
23% of 13 decks +20% synergy
Good-Fortune Unicorn
23% of 13 decks +20% synergy
Witty Roastmaster
23% of 13 decks +20% synergy
Jaheira, Friend of the Forest
23% of 13 decks +18% synergy
Arbor Elf
23% of 13 decks +17% synergy
Kami of Whispered Hopes
23% of 13 decks +16% synergy
Mondrak, Glory Dominus
23% of 13 decks +15% synergy
Instants
Eladamri's Call
31% of 13 decks +20% synergy
Worldly Tutor
31% of 13 decks +17% synergy
Generous Gift
31% of 13 decks +6% synergy
Heroic Intervention
31% of 13 decks +1% synergy
Beast Within
31% of 13 decks -6% synergy
Path to Exile
31% of 13 decks -16% synergy
Benefactor's Draught
23% of 13 decks +23% synergy
Aura Mutation
23% of 13 decks +20% synergy
Artifact Mutation
23% of 13 decks +19% synergy
Second Harvest
23% of 13 decks +18% synergy
Teferi's Protection
23% of 13 decks +4% synergy
Sorceries
Farseek
31% of 13 decks -4% synergy
Rampant Growth
31% of 13 decks -4% synergy
Cultivate
31% of 13 decks -14% synergy
Nature's Lore
23% of 13 decks -9% synergy
Blasphemous Act
23% of 13 decks -10% synergy
Utility Artifacts
Blade of the Bloodchief
23% of 13 decks +22% synergy
Altar of Dementia
23% of 13 decks +20% synergy
Helm of the Host
23% of 13 decks +20% synergy
Phyrexian Altar
23% of 13 decks +19% synergy
Ozolith, the Shattered Spire
23% of 13 decks +18% synergy
Ashnod's Altar
23% of 13 decks +16% synergy
Enchantments
Cryptolith Rite
23% of 13 decks +20% synergy
Parallel Lives
23% of 13 decks +16% synergy
Utopia Sprawl
23% of 13 decks +15% synergy
Hardened Scales
23% of 13 decks +14% synergy
Wild Growth
23% of 13 decks +12% synergy
Utility Lands
Yavimaya, Cradle of Growth
38% of 13 decks +29% synergy
Boseiju, Who Endures
23% of 13 decks +4% synergy
Mana Artifacts
Arcane Signet
62% of 13 decks -11% synergy
Sol Ring
62% of 13 decks -23% synergy
Lands
Command Tower
100% of 13 decks +26% synergy
Jetmir's Garden
69% of 13 decks +38% synergy
Stomping Ground
62% of 13 decks +21% synergy
Temple Garden
54% of 13 decks +14% synergy
Wooded Foothills
46% of 13 decks +36% synergy
Arid Mesa
46% of 13 decks +36% synergy
Karplusan Forest
46% of 13 decks +29% synergy
Battlefield Forge
46% of 13 decks +20% synergy
Jungle Shrine
46% of 13 decks +14% synergy
Sacred Foundry
46% of 13 decks +11% synergy
Exotic Orchard
46% of 13 decks +10% synergy
City of Brass
38% of 13 decks +31% synergy
Windswept Heath
38% of 13 decks +28% synergy
Brushland
38% of 13 decks +22% synergy
Rockfall Vale
38% of 13 decks +17% synergy
Bountiful Promenade
38% of 13 decks +15% synergy
Canopy Vista
38% of 13 decks +2% synergy
Lush Portico
38% of 8 decks +28% synergy
Commercial District
38% of 8 decks +28% synergy
Mana Confluence
31% of 13 decks +24% synergy
Savannah
31% of 13 decks +18% synergy
Taiga
31% of 13 decks +18% synergy
Fortified Village
31% of 13 decks +15% synergy
Game Trail
31% of 13 decks +15% synergy
Cinder Glade
31% of 13 decks -8% synergy
Prismatic Vista
23% of 13 decks +18% synergy
Bloodstained Mire
23% of 13 decks +12% synergy
Scalding Tarn
23% of 13 decks +12% synergy
Verdant Catacombs
23% of 13 decks +12% synergy
Misty Rainforest
23% of 13 decks +12% synergy
Plateau
23% of 13 decks +11% synergy
Temple of Plenty
23% of 13 decks +10% synergy
Temple of Abandon
23% of 13 decks +9% synergy
Sundown Pass
23% of 13 decks +8% synergy
Overgrown Farmland
23% of 13 decks +7% synergy
Temple of Triumph
23% of 13 decks +6% synergy
Spire Garden
23% of 13 decks -1% synergy
Sunpetal Grove
23% of 13 decks -1% synergy
Spectator Seating
23% of 13 decks -2% synergy
Clifftop Retreat
23% of 13 decks -7% synergy