Brain in a Jar

you scry — 420 cards in the game can cause this (Brain in a Jar is one).

When Brain in a Jar scries:

1. Prudent Fateseer // Peer Review — gives +1/+0
2. Diviner of Victory // Unwind History — gets +1/+1
3. Saheeli, Consul of Oversight — makes a token
4. Celeborn the Wise — makes your creatures bigger
5. Proft, Consulting Detective — puts a +1/+1 counter on itself
6. Matoya, Archon Elder — draws you 1 card
7. Denzilore Fatehold — puts a counter on a creature
8. Elminster — costs less
9. Elrond, Master of Healing — puts a counter on a creature
10. Galadriel of Lothlórien — puts a land onto the battlefield

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

an artifact is cast — 3,683 cards in the game can cause this (Brain in a Jar is one).

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

1. Spellweaver Volute — When a sorcery is cast thanks to Brain in a Jar, Spellweaver Volute copies a spell
2. Riku of Two Reflections — When an instant is cast thanks to Brain in a Jar, Riku of Two Reflections copies a spell
3. Sword of Wealth and Power — When an instant is cast thanks to Brain in a Jar, Sword of Wealth and Power copies a spell
4. Gale, Waterdeep Prodigy — When an instant is cast thanks to Brain in a Jar, Gale, Waterdeep Prodigy brings a card back
5. Harness the Storm — When an instant is cast thanks to Brain in a Jar, Harness the Storm brings a card back
6. Extus, Oriq Overlord // Awaken the Blood Avatar — When an instant is cast thanks to Brain in a Jar, Extus, Oriq Overlord // Awaken the Blood Avatar brings a card back
7. Metallurgic Summonings — When an instant is cast thanks to Brain in a Jar, Metallurgic Summonings makes a token
8. Storm-Kiln Artist — When an instant is cast thanks to Brain in a Jar, Storm-Kiln Artist makes a token
9. Niv-Mizzet, Parun — When an instant is cast thanks to Brain in a Jar, Niv-Mizzet, Parun draws you 1 card
10. Mica, Reader of Ruins — When an instant is cast thanks to Brain in a Jar, Mica, Reader of Ruins sacrifices an artifact

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