The Prismatic Piper

a creature attacks — 749 cards in The Prismatic Piper's colors can cause this (The Prismatic Piper is one).

When The Prismatic Piper attacks:

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

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

anything attacks — 749 cards in The Prismatic Piper's colors can cause this (The Prismatic Piper is one).

When The Prismatic Piper attacks:

1. ED-E, Lonesome Eyebot — puts a quest counter on itself
2. Dawnsire, Sunstar Dreadnought — deals 100 damage
3. Twins of Discord — triggers
4. Cosmic Cube — triggers
5. Doom's Time Platform — exiles a card from your graveyard

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

a creature blocks — 749 cards in The Prismatic Piper's colors can cause this (The Prismatic Piper is one).

When The Prismatic Piper blocks:

1. Barrow-Blade — strips abilities
2. Dead-Iron Sledge — kills a creature

a creature is cast — 755 cards in The Prismatic Piper's colors can cause this (The Prismatic Piper is one).

When The Prismatic Piper is cast:

1. Oketra's Monument — makes a token
2. Bontu's Monument — makes each opponent lose 1 life
3. Vanquisher's Banner — draws you 1 card
4. Rhonas's Monument — gives +2/+2
5. Traxos, Scourge Eternal — untaps itself
6. Hazoret's Monument — draws and discards
7. Kefnet's Monument — triggers

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

a nontoken creature enters the battlefield — 784 cards in The Prismatic Piper's colors can cause this (The Prismatic Piper is one).

1. Minion Reflector — When The Prismatic Piper enters, Minion Reflector makes a token

a creature enters the battlefield — 905 cards in The Prismatic Piper's colors can cause this (The Prismatic Piper is one).

When The Prismatic Piper enters:

1. Glaring Fleshraker — deals 1 damage
2. Blasting Station — untaps itself
3. Bloodline Pretender — puts a +1/+1 counter on itself
4. Soultether Golem — puts a time counter on itself
5. Symmetry Matrix — draws you 1 card
6. Monkey Cage — sacrifices itself
7. Eldrazi Mimic — triggers
8. Portcullis — flickers a creature
9. Decoction Module — puts a counter on a permanent you control
10. Ronin Warclub — triggers

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