Eureka

a permanent enters the battlefield — 152 cards in the game can cause this (Eureka is one).

When a permanent enters thanks to Eureka:

1. Dawn-Blessed Pennant — gains you 1 life
2. Altar of the Brood — mills a card
3. Amareth, the Lustrous — searches a library
4. Rimefire Torque — puts a charge counter on itself
5. Eye of Singularity — kills a permanent

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

a sorcery is cast — 3,720 cards in the game can cause this (Eureka is one).

1. Spellweaver Volute — When Eureka is cast, Spellweaver Volute copies a spell
2. Lilah, Undefeated Slickshot — When Eureka is cast, Lilah, Undefeated Slickshot gets +1/+1
3. Niblis of Frost — When Eureka is cast, Niblis of Frost gets +1/+1
4. Primeval Bounty — When Eureka is cast, Primeval Bounty puts 3 counters on a creature
5. Tetsuko Umezawa, Pursuer — When Eureka is cast, Tetsuko Umezawa, Pursuer gets +1/+1
6. Thor, God of Thunder — When Eureka is cast, Thor, God of Thunder deals that spell's mana value damage
7. Krile Baldesion — When Eureka is cast, Krile Baldesion brings a card back
8. Summon: Good King Mog XII — When Eureka is cast, Summon: Good King Mog XII makes a token
9. Kykar, Wind's Fury — When Eureka is cast, Kykar, Wind's Fury makes a token
10. Blood Funnel — When Eureka is cast, Blood Funnel sacrifices a creature

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

anything that is not a token enters the battlefield — 25,747 cards in the game can cause this (Eureka is one).

1. Canoptek Spyder — When a permanent enters thanks to Eureka, Canoptek Spyder draws you 1 card

anything enters the battlefield — 26,499 cards in the game can cause this (Eureka is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When a permanent enters thanks to Eureka, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself
2. HYDRA Assault Robot — When a permanent enters thanks to Eureka, HYDRA Assault Robot deals 1 damage
3. Pigment Wrangler // Striking Palette — When Pigment Wrangler // Striking Palette enters thanks to Eureka, it becomes prepared
4. Sokka, Bold Boomeranger — When Sokka, Bold Boomeranger enters thanks to Eureka, it draws and discards
5. Era of Innovation — When a permanent enters thanks to Eureka, Era of Innovation puts a counter on a permanent you control
6. Sanar, Unfinished Genius // Wild Idea — When Sanar, Unfinished Genius // Wild Idea enters thanks to Eureka, it becomes prepared

16 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 (Eureka is one).

1. Windrider Wizard — When Eureka is cast, Windrider Wizard draws you 1 card
2. Relic Amulet — When Eureka is cast, Relic Amulet puts a charge counter on itself
3. Rockslide Sorcerer — When Eureka is cast, Rockslide Sorcerer deals 1 damage
4. Umara Wizard // Umara Skyfalls — When Eureka is cast, Umara Wizard // Umara Skyfalls grants flying
5. Alania, Divergent Storm — When Eureka is cast, Alania, Divergent Storm makes an opponent draw 1 card
6. Umara Mystic — When Eureka is cast, Umara Mystic gets +2/+0
7. Master of Winds — When Eureka is cast, Master of Winds triggers

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