The Boulder, Ready to Rumble

a Warrior creature enters the battlefield — 308 cards in The Boulder's colors can cause this (The Boulder is one).

1. Obsidian Battle-Axe — When The Boulder, Ready to Rumble enters, Obsidian Battle-Axe triggers

a Warrior enters the battlefield — 310 cards in The Boulder's colors can cause this (The Boulder is one).

1. Decorated Champion — When The Boulder, Ready to Rumble enters, Decorated Champion puts a +1/+1 counter on itself

a Human enters the battlefield — 453 cards in The Boulder's colors can cause this (The Boulder is one).

When The Boulder, Ready to Rumble enters:

1. Heronblade Elite — puts a +1/+1 counter on itself
2. Dawnhart Disciple — gets +1/+1

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

When The Boulder, Ready to Rumble attacks:

1. Adaptive Omnitool — searches a library
2. The Earth King — searches a library
3. Staff of Titania — makes a token
4. Fractal Harness — puts counters on a permanent
5. Inquisitorial Rosette — makes a token
6. Andúril, Flame of the West — makes 2 tokens
7. Moonsilver Spear — 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 The Boulder's colors can cause this (The Boulder is one).

When The Boulder, Ready to Rumble 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 The Boulder's colors can cause this (The Boulder is one).

When The Boulder, Ready to Rumble blocks:

1. Barrow-Blade — strips abilities
2. Favor of the Woods — gains you 3 life
3. Gift of the Woods — gives +0/+3
4. Noxious Assault — puts a counter on a permanent
5. Ferocity — puts a counter on a permanent
6. Mammoth Harness — grants first strike
7. 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 The Boulder's colors can cause this (The Boulder is one).

When The Boulder, Ready to Rumble 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 The Boulder's colors can cause this (The Boulder is one).

When The Boulder, Ready to Rumble enters:

1. Dual Nature — makes a token
2. Bramble Sovereign — makes a token
3. Soul of the Harvest — draws you 1 card
4. Surrak and Goreclaw — puts a counter on a permanent
5. Rocksteady, Mutant Marauder — puts a counter on a creature
6. Radagast the Brown — searches a library
7. Minion Reflector — makes a token
8. The Great Henge — puts a counter on a permanent
9. Warden of the Grove — triggers
10. Life Finds a Way — 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 The Boulder's colors can cause this (The Boulder is one).

When The Boulder, Ready to Rumble enters:

1. Legolas Greenleaf — puts a counter on a permanent
2. Blasting Station — untaps itself
3. Bloodline Pretender — puts a +1/+1 counter on itself
4. Scurry Oak — puts a counter on itself
5. Soultether Golem — puts a time counter on itself
6. Vaultborn Tyrant — gains you 3 life
7. Prosperous Innkeeper — gains you 1 life
8. Monkey Cage — sacrifices itself
9. Gala Greeters — triggers

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