Drider

a Spider enters the battlefield — 206 cards in the game can cause this (Drider is one).

1. Mary Jane Watson — When a Spider enters thanks to Drider, Mary Jane Watson draws you 1 card

an Elf attacks — 723 cards in the game can cause this (Drider is one).

1. Celeborn the Wise — When Drider attacks, Celeborn the Wise scries
2. Tyvar the Bellicose — When Drider attacks, Tyvar the Bellicose grants deathtouch
3. Harald Unites the Elves — When Drider attacks, Harald Unites the Elves shrinks a creature by -1/-1
4. Arboreal Alliance — When Drider attacks, Arboreal Alliance triggers

a nontoken Elf enters the battlefield — 728 cards in the game can cause this (Drider is one).

1. Wirewood Hivemaster — When Drider enters, Wirewood Hivemaster makes a token

an Elf enters the battlefield — 752 cards in the game can cause this (Drider is one).

1. Wolverine Riders — When Drider enters, Wolverine Riders gains you its toughness life
2. Elvish Warmaster — When Drider enters, Elvish Warmaster makes a token
3. Elvish Vanguard — When Drider enters, Elvish Vanguard puts a +1/+1 counter on itself
4. Marwyn, the Nurturer — When Drider enters, Marwyn, the Nurturer puts a +1/+1 counter on itself
5. Woodland Weavemaster — When Drider enters, Woodland Weavemaster gets +1/+1
6. High Perfect Morcant — When Drider enters, High Perfect Morcant puts a counter on a permanent an opponent controls
7. Maralen, Fae Ascendant — When Drider enters, Maralen, Fae Ascendant exiles a card from an opponent's library

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

a creature token enters the battlefield — 2,799 cards in the game can cause this (Drider is one).

When a Spider enters thanks to Drider:

1. Securitron Squadron — puts a counter on a permanent
2. Anointer Priest — gains you 1 life
3. Nesting Dovehawk — puts a +1/+1 counter on itself

a creature token is created — 2,799 cards in the game can cause this (Drider is one).

1. Staff of the Storyteller — When Drider makes a Spider token, Staff of the Storyteller puts a story counter on itself

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

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

When a Spider enters thanks to Drider:

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 a token
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 (Drider is one).

When Drider makes a Spider 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.

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

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

126 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 (Drider is one).

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

196 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 (Drider is one).

1. Mage Hunters' Onslaught — When Drider blocks, Mage Hunters' Onslaught makes a player lose 1 life
2. Tide of War — When Drider blocks, Tide of War sacrifices a creature
3. Dead-Iron Sledge — When Drider blocks, Dead-Iron Sledge kills a creature
4. Dwindle — When Drider blocks, Dwindle kills a creature

26 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 (Drider is one).

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

335 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 (Drider is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When a Spider enters thanks to Drider, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself

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