Trinisphere

a planeswalker it makes cheaper to cast — 312 cards in the game can cause this (Trinisphere is one).

Trinisphere reduces what:

1. Karn, Scion of Urza — costs
2. Saheeli, the Gifted — costs

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

a sorcery it makes cheaper to cast — 3,585 cards in the game can cause this (Trinisphere is one).

Trinisphere reduces what:

1. Their Number Is Legion — costs
2. Emergency Weld — costs

3,583 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 (Trinisphere is one).

When Trinisphere 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.

an enchantment it makes cheaper to cast — 3,713 cards in the game can cause this (Trinisphere is one).

Trinisphere reduces what:

1. Invasion of Tolvada // The Broken Sky — costs
2. Promise of Aclazotz // Foul Rebirth — costs
3. Biotransference — costs
4. Efficient Construction — costs
5. Robot Domination — costs

3,708 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 (Trinisphere is one).

When Trinisphere 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 instant it makes cheaper to cast — 3,773 cards in the game can cause this (Trinisphere is one).

1. Start // Finish — Trinisphere reduces what Start // Finish costs

3,772 other cards care about it too. These are the ones with the most connections.

an artifact it makes cheaper to cast — 4,531 cards in the game can cause this (Trinisphere is one).

Trinisphere reduces what:

1. Urabrask // The Great Work — costs
2. Sanar, Unfinished Genius // Wild Idea — costs
3. Daretti, Ingenious Iconoclast — costs
4. Urza's Command — costs
5. Elesh Norn // The Argent Etchings — costs
6. Yotia Declares War — costs
7. Parasitic Implant — costs
8. Urza's Saga — costs
9. Pestilent Cauldron // Restorative Burst — costs
10. Haunt the Network — costs

4,520 other cards care about it too. These are the ones with the most connections.

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

When Trinisphere 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

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

a creature it makes cheaper to cast — 19,392 cards in the game can cause this (Trinisphere is one).

Trinisphere reduces what:

1. Extravagant Replication — costs
2. Devouring Sugarmaw // Have for Dinner — costs
3. Fuss // Bother — costs
4. The Rani — costs
5. Indulge // Excess — costs
6. Thopter Spy Network — costs
7. Dovin, Grand Arbiter — costs
8. Kaito, Dancing Shadow — costs
9. Saheeli, Sublime Artificer — costs
10. Metallurgic Summonings — costs

19,382 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 (Trinisphere is one).

When Trinisphere enters:

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

687 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 (Trinisphere is one).

1. Sokka, Bold Boomeranger — When Trinisphere is cast, Sokka, Bold Boomeranger puts a +1/+1 counter on itself

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