Brood Keeper

a Dragon enters the battlefield — 524 cards in the game can cause this (Brood Keeper is one).

When a Dragon enters thanks to Brood Keeper:

1. Dragon Tempest — deals damage
2. Bloomvine Regent // Claim Territory — gains you 3 life
3. Sarkhan, Dragon Ascendant — puts a +1/+1 counter on itself
4. Ganax, Astral Hunter — makes a token
5. Scourge of Valkas — deals damage
6. Bladewing's Thrall — returns itself from the graveyard
7. Sarkhan, Soul Aflame — copies a permanent
8. Teeming Dragonstorm — triggers
9. Corroding Dragonstorm — triggers
10. Roiling Dragonstorm — triggers

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

a Shaman creature enters the battlefield — 539 cards in the game can cause this (Brood Keeper is one).

1. Thornbite Staff — When Brood Keeper enters, Thornbite Staff triggers

provide a creature to sacrifice — 2,720 cards in the game can cause this.

1. Industrial Advancement — Brood Keeper makes fodder for Industrial Advancement
2. Divergent Transformations — Brood Keeper makes fodder for Divergent Transformations
3. Transmogrify — Brood Keeper makes fodder for Transmogrify

2,717 other cards cause 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 (Brood Keeper is one).

When a Dragon enters thanks to Brood Keeper:

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 (Brood Keeper is one).

1. Staff of the Storyteller — When Brood Keeper makes a Dragon 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 (Brood Keeper is one).

When a Dragon enters thanks to Brood Keeper:

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 (Brood Keeper is one).

When Brood Keeper makes a Dragon 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.

a Human enters the battlefield — 4,639 cards in the game can cause this (Brood Keeper is one).

When Brood Keeper 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.

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

When Brood Keeper 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

123 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 (Brood Keeper is one).

When Brood Keeper 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

201 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 (Brood Keeper is one).

1. Tide of War — When Brood Keeper blocks, Tide of War sacrifices a creature

29 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 (Brood Keeper is one).

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

338 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 (Brood Keeper is one).

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

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