Altar of the Brood

put a permanent onto the battlefield — 152 cards in the game can cause this.

1. It That Betrays — When It That Betrays enters, Altar of the Brood mills a card
2. Nazgûl Battle-Mace — When Nazgûl Battle-Mace enters, Altar of the Brood mills a card
3. Pyxis of Pandemonium — When Pyxis of Pandemonium enters, Altar of the Brood mills a card
4. Mole Module — When Mole Module enters, Altar of the Brood mills a card
5. Anticausal Vestige — When a permanent enters thanks to Anticausal Vestige, Altar of the Brood mills a card
6. Matter Reshaper — When a permanent enters thanks to Matter Reshaper, Altar of the Brood mills a card
7. Staff of Eden, Vault's Key — When a permanent enters thanks to Staff of Eden, Vault's Key, Altar of the Brood mills a card
8. Desecrate Reality — When a permanent enters thanks to Desecrate Reality, Altar of the Brood mills a card
9. Deep Space 9 — When Deep Space 9 enters, Altar of the Brood mills a card
10. Planar Bridge — When a permanent enters thanks to Planar Bridge, Altar of the Brood mills a card

142 other cards cause it too. These are the ones with the most connections.

a card is milled — 772 cards in the game can cause this (Altar of the Brood is one).

1. Lo and Li, Royal Advisors — When a permanent makes a player mill a card thanks to Altar of the Brood, Lo and Li, Royal Advisors puts a counter on an Advisor

an artifact is cast — 3,683 cards in the game can cause this (Altar of the Brood is one).

When Altar of the Brood is cast:

1. Mendicant Core, Guidelight — copies a spell
2. Sai, Master Thopterist — makes a token
3. Ravenous Robots — makes a token
4. Pinnacle Emissary — makes a token
5. Mirrodin Besieged — makes a token
6. Poetic Ingenuity — makes a token
7. Digsite Engineer — makes a token
8. Myrsmith — makes a token
9. Riddlesmith — draws you 1 card
10. Dr. Madison Li — puts a counter on a permanent you control

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

a nontoken artifact enters the battlefield — 3,768 cards in the game can cause this (Altar of the Brood is one).

When Altar of the Brood enters:

1. Ultron, Artificial Malevolence — makes a token
2. The Prydwen, Steel Flagship — makes a token
3. Conquest Mission — puts a quest counter on itself
4. Surge Conductor — proliferates
5. Replication Specialist — makes a token
6. Weapons Manufacturing — makes a token
7. Mirrorworks — makes a token

an artifact enters the battlefield — 4,643 cards in the game can cause this (Altar of the Brood is one).

When Altar of the Brood enters:

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.

a card in a graveyard — 7,589 cards in the game can cause this (Altar of the Brood is one).

1. Vessel of Endless Rest — Altar of the Brood puts cards into the graveyard that Vessel of Endless Rest can bring back
2. Fire Nation Salvagers — Altar of the Brood puts cards into the graveyard that Fire Nation Salvagers can bring back
3. Bloodbond March — Altar of the Brood puts cards into the graveyard that Bloodbond March can bring back
4. Heart-Shaped Herb — Altar of the Brood puts cards into the graveyard that Heart-Shaped Herb can bring back
5. Enlightened Confidant — Altar of the Brood puts cards into the graveyard that Enlightened Confidant can bring back
6. Tergrid, God of Fright // Tergrid's Lantern — Altar of the Brood puts cards into the graveyard that Tergrid, God of Fright // Tergrid's Lantern can bring back
7. Grazing Kelpie — Altar of the Brood puts cards into the graveyard that Grazing Kelpie can bring back
8. Dauthi Voidwalker — Cards Altar of the Brood would put into an opponent's graveyard are exiled by Dauthi Voidwalker instead, and it can play from among them
9. Spurnmage Advocate — Altar of the Brood puts cards into the graveyard that Spurnmage Advocate can bring back
10. Merfolk Windrobber — Altar of the Brood fills an opponent's graveyard toward the 8 or more cards Merfolk Windrobber needs

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

anything goes to a graveyard — 7,589 cards in the game can cause this (Altar of the Brood is one).

When a card hits the graveyard thanks to Altar of the Brood:

1. The Haunt of Hightower — puts a +1/+1 counter on itself
2. Duskmantle Guildmage — makes each opponent lose 1 life
3. Vulturous Zombie — puts a +1/+1 counter on itself
4. Bloodchief Ascension — makes each opponent lose 2 life
5. Compost — draws you 1 card
6. Planar Void — hits a graveyard

5 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 (Altar of the Brood is one).

When Altar of the Brood enters:

1. HYDRA Assault Robot — deals 1 damage
2. Era of Innovation — puts a counter on a permanent you control

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

anything is cast — 31,128 cards in the game can cause this (Altar of the Brood is one).

When Altar of the Brood is cast:

1. Sokka, Bold Boomeranger — puts a +1/+1 counter on itself
2. Saheeli, Radiant Creator — puts a counter on a permanent you control

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