Mr. Spock, Science Officer

a Human enters the battlefield — 634 cards in Mr. Spock's colors can cause this (Mr. Spock is one).

1. Captain of the Mists — When Mr. Spock, Science Officer enters, Captain of the Mists untaps itself

a creature attacks — 3,238 cards in Mr. Spock's colors can cause this (Mr. Spock is one).

When Mr. Spock, Science Officer 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. Inquisitorial Rosette — makes a token
7. Andúril, Flame of the West — makes 2 tokens
8. Saw — sacrifices a creature
9. Ultima Weapon — kills a creature an opponent controls
10. Throwing Knife — sacrifices itself

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

anything attacks — 3,238 cards in Mr. Spock's colors can cause this (Mr. Spock is one).

When Mr. Spock, Science Officer attacks:

1. ED-E, Lonesome Eyebot — puts a quest counter on itself
2. Madame Web, Clairvoyant — mills a card
3. Dawnsire, Sunstar Dreadnought — deals 100 damage
4. Curse of Verbosity — draws you 1 card
5. Gossip's Talent — triggers
6. Alora, Merry Thief — triggers
7. Twins of Discord — triggers
8. Great Gilded Boat — draws and discards
9. Cosmic Cube — triggers
10. 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 — 3,238 cards in Mr. Spock's colors can cause this (Mr. Spock is one).

When Mr. Spock, Science Officer blocks:

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

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

a creature is cast — 3,254 cards in Mr. Spock's colors can cause this (Mr. Spock is one).

When Mr. Spock, Science Officer is cast:

1. Oketra's Monument — makes a token
2. Kozilek's Unsealing — makes 2 tokens
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

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

a nontoken creature enters the battlefield — 3,316 cards in Mr. Spock's colors can cause this (Mr. Spock is one).

When Mr. Spock, Science Officer enters:

1. Arni, Humble Scribe — untaps itself
2. Minion Reflector — makes a token
3. Overburden — triggers

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

a creature enters the battlefield — 3,581 cards in Mr. Spock's colors can cause this (Mr. Spock is one).

When Mr. Spock, Science Officer enters:

1. Ray Fillet, Wave Warrior — puts a counter on itself
2. Pollywog Prodigy — puts a counter on itself
3. Blasting Station — untaps itself
4. Bloodline Pretender — puts a +1/+1 counter on itself
5. Sage's Row Denizen — mills a card
6. Soultether Golem — puts a time counter on itself
7. Simic Fluxmage — puts a counter on itself
8. Simic Manipulator — puts a counter on itself
9. Cloudfin Raptor — puts a counter on itself
10. Monkey Cage — sacrifices itself

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