Guardian of the Great Door

a land becomes tapped — 50 cards in the game can cause this (Guardian of the Great Door is one).

When a land becomes tapped thanks to Guardian of the Great Door:

1. Steam Vines — deals 1 damage
2. Pooling Venom — makes a player lose 2 life
3. Chronic Flooding — mills a card
4. Psychic Venom — deals 2 damage
5. Corrupted Roots — makes a player lose 2 life
6. Orcish Mine — triggers
7. Spreading Algae — kills it
8. Blight — kills it
9. Uncontrolled Infestation — kills it
10. Kudzu — kills a land

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

an artifact becomes tapped — 88 cards in the game can cause this (Guardian of the Great Door is one).

When an artifact becomes tapped thanks to Guardian of the Great Door:

1. Relic Bind — deals 1 damage
2. Artifact Possession — deals 2 damage
3. Haunting Wind — deals 1 damage
4. Relic Putrescence — puts a counter on a permanent

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

an Angel enters the battlefield — 354 cards in the game can cause this (Guardian of the Great Door is one).

When Guardian of the Great Door enters:

1. Bishop of Wings — gains you 4 life
2. Youthful Valkyrie — puts a +1/+1 counter on itself
3. Seraph Sanctuary — gains you 1 life
4. Righteous Valkyrie — gains you that creature's toughness life

a creature becomes tapped — 565 cards in the game can cause this (Guardian of the Great Door is one).

When Guardian of the Great Door becomes tapped:

1. Unctus, Grand Metatect — draws you 1 card
2. Sharae of Numbing Depths — draws you 1 card
3. Rewrite History — draws you 1 card
4. Stinging Licid — deals 2 damage
5. Icewrought Sentry — gets +2/+1
6. Hawkeye's Bow — deals 1 damage
7. Lust for War — deals 3 damage
8. Cryoshatter — kills a creature
9. Don't Move — kills a creature
10. Hylda of the Icy Crown — triggers

11 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 (Guardian of the Great Door is one).

When Guardian of the Great Door 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

111 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 (Guardian of the Great Door is one).

When Guardian of the Great Door 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. Jolene, Plundering Pugilist — makes a token
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

181 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 (Guardian of the Great Door is one).

When Guardian of the Great Door blocks:

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

24 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 (Guardian of the Great Door is one).

1. Mardu Ascendancy — When Guardian of the Great Door attacks, Mardu Ascendancy makes a token

2 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 (Guardian of the Great Door is one).

When Guardian of the Great Door enters:

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

299 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 (Guardian of the Great Door is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When Guardian of the Great Door enters, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself

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