Narcomoeba

anything leaves a graveyard — 2,503 cards in the game can cause this (Narcomoeba is one).

When Narcomoeba leaves a graveyard:

1. Blastoneuron — makes each opponent lose 1 life
2. Defiled Crypt // Cadaver Lab — makes a token
3. Teval, the Balanced Scale — makes a token
4. Hologram Stalker — makes a token
5. Tormod, the Desecrator — makes a token
6. Quintorius, Field Historian — makes a token
7. Garrison Excavator — makes a token
8. Amzu, Swarm's Hunger — makes a token
9. Kirol, History Buff // Pack a Punch — becomes prepared
10. Teval's Judgment — triggers

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

anything attacks — 17,934 cards in the game can cause this (Narcomoeba is one).

When Narcomoeba attacks:

1. Far Fortune, End Boss — deals 1 damage
2. Temmet, Naktamun's Will — draws you 1 card
3. Grim Javelineer — gives +1/+0
4. Invisible Woman — triggers
5. Caesar, Legion's Emperor — sacrifices a creature
6. Guide of Souls — triggers
7. Campsite Cuisine — sacrifices a Food
8. Gossip's Talent — triggers
9. Banon, the Returners' Leader — draws and discards
10. Toph, Earthbending Master — puts a counter on a permanent

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

a creature attacks — 17,934 cards in the game can cause this (Narcomoeba is one).

When Narcomoeba attacks:

1. Adaptive Omnitool — searches a library
2. Anthem of Rakdos — gives +2/+0
3. Kindred Discovery — draws you 1 card
4. Invasion of New Capenna // Holy Frazzle-Cannon — puts counters on a permanent
5. Chorale of the Void — brings a card back
6. Anim Pakal, Thousandth Moon — puts a +1/+1 counter on itself
7. Saw — sacrifices a creature
8. Gisa's Favorite Shovel — makes an opponent sacrifice a creature
9. Ultima Weapon — kills a creature an opponent controls
10. Total War — kills a creature

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

a creature blocks — 17,934 cards in the game can cause this (Narcomoeba is one).

When Narcomoeba blocks:

1. Mage Hunters' Onslaught — makes a player lose 1 life
2. Carnage Gladiator — makes a player lose 1 life
3. Barrow-Blade — strips abilities
4. Heat of Battle — deals 1 damage
5. Battle Strain — deals 1 damage
6. Favor of the Woods — gains you 3 life
7. Tide of War — sacrifices a creature
8. Dead-Iron Sledge — kills a creature
9. Dwindle — kills a creature
10. Shield of the Righteous — triggers

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

a nontoken creature attacks — 17,934 cards in the game can cause this (Narcomoeba is one).

When Narcomoeba attacks:

1. Mardu Ascendancy — makes a token
2. Basri Ket — makes a token
3. Militia's Pride — makes a token

a creature enters the battlefield — 19,800 cards in the game can cause this (Narcomoeba is one).

When Narcomoeba enters:

1. Slash, Reptile Rampager — deals 2 damage
2. Ray Fillet, Wave Warrior — puts a counter on itself
3. Bess, Soul Nourisher — puts a +1/+1 counter on itself
4. The Neutrinos — gets +1/+0
5. Wingnut, Bat on the Belfry — grants flying, haste and menace
6. Aetherstorm Roc — puts a counter on a permanent you control
7. Raphael, Most Attitude — exiles a card from your library

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

anything enters the battlefield — 26,499 cards in the game can cause this (Narcomoeba is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When Narcomoeba enters, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself
2. Ivora, Insatiable Heir — When Ivora, Insatiable Heir enters thanks to Narcomoeba, it makes a token
3. Path of Mettle // Metzali, Tower of Triumph — When Path of Mettle // Metzali, Tower of Triumph enters thanks to Narcomoeba, it deals 1 damage
4. Dogmeat, Ever Loyal — When Dogmeat, Ever Loyal enters thanks to Narcomoeba, it mills a card
5. The Earth King — When The Earth King enters thanks to Narcomoeba, it makes a token
6. SP//dr, Piloted by Peni — When SP//dr, Piloted by Peni enters thanks to Narcomoeba, it puts a counter on a creature
7. Mu Yanling, Wind Rider — When Mu Yanling, Wind Rider enters thanks to Narcomoeba, it makes a token
8. The Rani — When The Rani enters thanks to Narcomoeba, it makes a token
9. J. Jonah Jameson — When J. Jonah Jameson enters thanks to Narcomoeba, it triggers
10. Ultimecia, Temporal Threat — When Ultimecia, Temporal Threat enters thanks to Narcomoeba, it taps a creature an opponent controls

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