Flatman

a Mutant attacks — 74 cards in Flatman's colors can cause this (Flatman is one).

1. Wolverine, Claws Out — When Flatman attacks, Wolverine, Claws Out makes your creatures bigger

a Mutant enters the battlefield — 76 cards in Flatman's colors can cause this (Flatman is one).

1. X-23, Deadly Weapon — When Flatman enters, X-23, Deadly Weapon puts a counter on a permanent

a Hero enters the battlefield — 71 cards in Flatman's colors can cause this (Flatman is one).

1. Team Transmitter — When Flatman enters, Team Transmitter gains you 1 life

a creature attacks — 3,620 cards in Flatman's colors can cause this (Flatman is one).

When Flatman attacks:

1. Adaptive Omnitool — searches a library
2. Staff of Titania — makes a token
3. Fractal Harness — puts counters on a permanent
4. Inquisitorial Rosette — makes a token
5. Andúril, Flame of the West — makes 2 tokens
6. Moonsilver Spear — makes a token
7. Captain's Claws — makes a token
8. Saw — sacrifices a creature
9. Ultima Weapon — kills a creature an opponent controls
10. Throwing Knife — sacrifices itself

40 other cards care about it too. These are the ones with the most connections.

anything attacks — 3,620 cards in Flatman's colors can cause this (Flatman is one).

When Flatman attacks:

1. ED-E, Lonesome Eyebot — puts a quest counter on itself
2. Hazardroot Herbalist — gives +1/+0
3. Ranger Class — puts a counter on a creature
4. Dawnsire, Sunstar Dreadnought — deals 100 damage
5. Hunter's Talent — gives +1/+0
6. Campsite Cuisine — sacrifices a Food
7. Toph, Earthbending Master — puts a counter on a permanent
8. Twins of Discord — triggers
9. Cosmic Cube — triggers
10. Doom's Time Platform — exiles a card from your graveyard

6 other cards care about it too. These are the ones with the most connections.

a creature blocks — 3,620 cards in Flatman's colors can cause this (Flatman is one).

1. Barrow-Blade — When Flatman blocks, Barrow-Blade strips abilities
2. Favor of the Woods — When Flatman blocks, Favor of the Woods gains you 3 life
3. Gift of the Woods — When Flatman blocks, Gift of the Woods gives +0/+3
4. Noxious Assault — When Flatman blocks, Noxious Assault puts a counter on a permanent
5. Ferocity — When Flatman blocks, Ferocity puts a counter on a permanent
6. Mammoth Harness — When Flatman blocks, Mammoth Harness grants first strike
7. Dead-Iron Sledge — When Flatman blocks, Dead-Iron Sledge kills a creature

1 other card cares about it too. These are the ones with the most connections.

a creature is cast — 3,640 cards in Flatman's colors can cause this (Flatman is one).

When Flatman is cast:

1. Primeval Bounty — makes a token
2. Dancing from Dark to Dawn — puts that spell's mana value counters on a creature
3. Summon: Fenrir — it arrives with counters thanks to Summon: Fenrir
4. Mona Lisa, Ever Adaptable — makes a token
5. Champions of the Perfect — draws you 1 card
6. Masked Admirers — returns itself from the graveyard
7. Primordial Sage — draws you 1 card
8. Oketra's Monument — makes a token
9. Beast Whisperer — draws you 1 card
10. Silverback Elder — triggers

29 other cards care about it too. These are the ones with the most connections.

a nontoken creature enters the battlefield — 3,710 cards in Flatman's colors can cause this (Flatman is one).

1. Dual Nature — When Flatman enters, Dual Nature makes a token
2. Bramble Sovereign — When Flatman enters, Bramble Sovereign makes a token
3. Soul of the Harvest — When Flatman enters, Soul of the Harvest draws you 1 card
4. Surrak and Goreclaw — When Flatman enters, Surrak and Goreclaw puts a counter on a permanent
5. Rocksteady, Mutant Marauder — When Flatman enters, Rocksteady, Mutant Marauder puts a counter on a creature
6. Radagast the Brown — When Flatman enters, Radagast the Brown searches a library
7. Minion Reflector — When Flatman enters, Minion Reflector makes a token
8. The Great Henge — When Flatman enters, The Great Henge puts a counter on a permanent
9. Guardian Project — When Flatman enters, Guardian Project draws you 1 card
10. Warden of the Grove — When Flatman enters, Warden of the Grove triggers

2 other cards care about it too. These are the ones with the most connections.

a creature enters the battlefield — 4,064 cards in Flatman's colors can cause this (Flatman is one).

1. Legolas Greenleaf — When Flatman enters, Legolas Greenleaf puts a counter on a permanent
2. Blasting Station — When Flatman enters, Blasting Station untaps itself
3. Bloodline Pretender — When Flatman enters, Bloodline Pretender puts a +1/+1 counter on itself
4. Scurry Oak — When Flatman enters, Scurry Oak puts a counter on itself
5. Soultether Golem — When Flatman enters, Soultether Golem puts a time counter on itself
6. Prosperous Innkeeper — When Flatman enters, Prosperous Innkeeper gains you 1 life
7. Ivy Lane Denizen — When Flatman enters, Ivy Lane Denizen puts a counter on a creature
8. Selvala, Heart of the Wilds — When Flatman enters, Selvala, Heart of the Wilds makes a player draw 1 card
9. Monkey Cage — When Flatman enters, Monkey Cage sacrifices itself
10. Gala Greeters — When Flatman enters, Gala Greeters triggers

72 other cards care about it too. These are the ones with the most connections.