Idris, Soul of the TARDIS

a nontoken artifact is exiled — 101 cards in Idris's colors can cause this (Idris is one).

1. Slagstone Refinery — When an artifact is exiled thanks to Idris, Soul of the TARDIS, Slagstone Refinery makes a token

a Human enters the battlefield — 1,353 cards in Idris's colors can cause this (Idris is one).

When Idris, Soul of the TARDIS enters:

1. Captain of the Mists — untaps itself
2. Erkenbrand, Lord of Westfold — gives +1/+0
3. Vigilante Justice — deals 1 damage

anything attacks — 6,189 cards in Idris's colors can cause this (Idris is one).

When Idris, Soul of the TARDIS attacks:

1. Shaun, Father of Synths — makes a token
2. ED-E, Lonesome Eyebot — puts a quest counter on itself
3. Madame Web, Clairvoyant — mills a card
4. Misty Mountains Raider — puts 2 counters on a Goblin or Army
5. Razorkin Hordecaller — makes a token
6. Gossip's Talent — triggers
7. Inti, Seneschal of the Sun — triggers
8. Gut, True Soul Zealot — sacrifices a creature or artifact
9. Cool but Rude — draws and discards
10. Swashbuckler Extraordinaire — sacrifices a Treasure

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

a creature attacks — 6,189 cards in Idris's colors can cause this (Idris is one).

When Idris, Soul of the TARDIS attacks:

1. Adaptive Omnitool — searches a library
2. Kindred Discovery — draws you 1 card
3. Screaming Swarm — mills a card
4. Imperious Mindbreaker — mills a card
5. Staff of Titania — makes a token
6. Saw — sacrifices a creature
7. Ultima Weapon — kills a creature an opponent controls
8. Total War — kills a creature
9. The Spear of Leonidas — triggers
10. Norin the Wary — flickers itself

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

a creature blocks — 6,189 cards in Idris's colors can cause this (Idris is one).

When Idris, Soul of the TARDIS blocks:

1. Barrow-Blade — strips abilities
2. Heat of Battle — deals 1 damage
3. Battle Strain — deals 1 damage
4. Tide of War — sacrifices a creature
5. Dead-Iron Sledge — kills a creature
6. Dwindle — kills a creature

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

a creature is cast — 6,218 cards in Idris's colors can cause this (Idris is one).

When Idris, Soul of the TARDIS is cast:

1. Summon: Brynhildr — grants haste
2. Oketra's Monument — makes a token
3. The Clone Saga — copies a spell
4. Customs Depot — draws you 1 card
5. Bontu's Monument — makes each opponent lose 1 life
6. Vanquisher's Banner — draws you 1 card
7. Rhonas's Monument — gives +2/+2
8. Hazoret's Monument — draws and discards
9. Aether Barrier — makes a player sacrifice a permanent
10. Kefnet's Monument — triggers

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

a nontoken creature enters the battlefield — 6,294 cards in Idris's colors can cause this (Idris is one).

When Idris, Soul of the TARDIS enters:

1. Arni, Humble Scribe — untaps itself
2. Minion Reflector — makes a token
3. Molten Echoes — makes a token
4. Flameshadow Conjuring — makes a token
5. Mirror March — flips a coin
6. Overburden — triggers

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

a creature enters the battlefield — 6,749 cards in Idris's colors can cause this (Idris is one).

When Idris, Soul of the TARDIS enters:

1. Slash, Reptile Rampager — deals 2 damage
2. Gimli of the Glittering Caves — puts counters on a permanent
3. Ray Fillet, Wave Warrior — puts a counter on itself
4. Wingnut, Bat on the Belfry — grants flying, haste and menace
5. Pollywog Prodigy — puts a counter on itself
6. Blasting Station — untaps itself
7. Raphael, Most Attitude — exiles a card from your library
8. Mogg Bombers — sacrifices itself
9. Flame-Kin War Scout — sacrifices itself
10. Monkey Cage — sacrifices itself

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