April O'Neil, Human Element

a Detective enters the battlefield — 148 cards in the game can cause this (April O'Neil is one).

When April O'Neil, Human Element enters:

1. Case of the Pilfered Proof — puts a counter on a permanent
2. Projektor Inspector — draws you 1 card
3. Perimeter Enforcer — gets +1/+1

cast an artifact — 3,683 cards in the game can cause this.

1. Relic Amulet — When Relic Amulet is cast, April O'Neil, Human Element makes a token
2. Chimeric Egg — When Chimeric Egg is cast, April O'Neil, Human Element makes a token
3. Tome of Legends — When Tome of Legends is cast, April O'Neil, Human Element makes a token
4. Canoptek Spyder — When Canoptek Spyder is cast, April O'Neil, Human Element makes a token
5. Sword of Wealth and Power — When Sword of Wealth and Power is cast, April O'Neil, Human Element makes a token
6. Cloudstone Curio — When Cloudstone Curio is cast, April O'Neil, Human Element makes a token
7. Traxos, Scourge Eternal — When Traxos, Scourge Eternal is cast, April O'Neil, Human Element makes a token
8. Lux Artillery — When Lux Artillery is cast, April O'Neil, Human Element makes a token
9. Soultether Golem — When Soultether Golem is cast, April O'Neil, Human Element makes a token
10. Contested Game Ball — When Contested Game Ball is cast, April O'Neil, Human Element makes a token

3,673 other cards cause it too. These are the ones with the most connections.

a token enters the battlefield — 3,710 cards in the game can cause this (April O'Neil is one).

When a Mutagen enters thanks to April O'Neil, Human Element:

1. Baron Bertram Graywater — makes a token
2. Marneus Calgar — draws you 1 card
3. Belladonna Took — gains you 1 life
4. Kambal, Profiteering Mayor — makes each opponent lose 1 life
5. Lucy MacLean, Positively Armed — makes a token
6. Mister Fantastic, Reed Richards — draws you 1 card
7. Cloakwood Swarmkeeper — puts a +1/+1 counter on itself
8. Woodland Champion — puts that many +1/+1 counters on itself
9. Leonardo, the Balance — puts a counter on a creature
10. Spiritcall Enthusiast // Scrollboost — becomes prepared

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

a token is created — 3,711 cards in the game can cause this (April O'Neil is one).

When April O'Neil, Human Element makes a Mutagen token:

1. Akim, the Soaring Wind — makes a token
2. Idol of Oblivion — draws you 1 card
3. Rosie Cotton of South Lane — puts a counter on a permanent
4. Mirkwood Bats — makes each opponent lose 1 life

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

an artifact it grants types to — 4,531 cards in the game can cause this.

1. Silverskin Armor — Silverskin Armor gives April O'Neil, Human Element an extra creature type

4,530 other cards cause it too. These are the ones with the most connections.

a Human enters the battlefield — 4,639 cards in the game can cause this (April O'Neil is one).

When April O'Neil, Human Element enters:

1. General Kudro of Drannith — hits a graveyard
2. Heronblade Elite — puts a +1/+1 counter on itself
3. Kyler, Sigardian Emissary — puts a +1/+1 counter on itself
4. Thalia's Lieutenant — puts a +1/+1 counter on itself
5. Champion of the Parish — puts a +1/+1 counter on itself
6. Captain of the Mists — untaps itself
7. Erkenbrand, Lord of Westfold — gives +1/+0
8. Beregond of the Guard — gives +1/+1
9. Théoden, King of Rohan — grants double strike
10. Lossarnach Captain — taps a creature an opponent controls

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

an artifact enters the battlefield — 4,643 cards in the game can cause this (April O'Neil is one).

When a Mutagen enters thanks to April O'Neil, Human Element:

1. Transplant Theorist — draws you 1 card
2. Elvish Archivist — puts 2 +1/+1 counters on itself
3. Golbez, Crystal Collector — surveils
4. Sludge Strider — makes a player lose 1 life
5. Underhanded Designs — makes each opponent lose 1 life
6. Mechan Assembler — makes a token
7. Glassdust Hulk — gets +1/+1
8. Rook Turret — draws you 1 card
9. Hedron Detonator — deals 1 damage
10. Pactdoll Terror — makes each opponent lose 1 life

56 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 (April O'Neil is one).

When April O'Neil, Human Element 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

120 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 (April O'Neil is one).

When April O'Neil, Human Element attacks:

1. Adaptive Omnitool — searches a library
2. Anthem of Rakdos — gives +2/+0
3. Kindred Discovery — draws you 1 card
4. Saw — sacrifices a creature

192 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 (April O'Neil is one).

1. Tide of War — When April O'Neil, Human Element blocks, Tide of War sacrifices a creature

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

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

When April O'Neil, Human Element 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. Legolas Greenleaf — puts a counter on a permanent
5. The Neutrinos — gets +1/+0
6. Wingnut, Bat on the Belfry — grants flying, haste and menace
7. Aetherstorm Roc — puts a counter on a permanent you control
8. Raphael, Most Attitude — exiles a card from your library

322 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 (April O'Neil is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When April O'Neil, Human Element enters, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself

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