Firestorm

a card is discarded — 2,042 cards in the game can cause this (Firestorm is one).

When Firestorm makes a player discard a card:

1. Ivora, Insatiable Heir — puts a +1/+1 counter on itself
2. Cool but Rude — deals 2 damage
3. Containment Construct — brings a card back
4. Moonstone, Harsh Mistress — brings a card back
5. Lazotep Chancellor — puts 2 counters on a Zombie or Army
6. Magmakin Artillerist — deals that much damage
7. Inti, Seneschal of the Sun — exiles a card from your library
8. Pitchstone Wall — sacrifices itself
9. Currency Converter — exiles it
10. Hostile Investigator — triggers

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

anything deals noncombat damage — 3,068 cards in the game can cause this (Firestorm is one).

When Firestorm deals noncombat damage:

1. Quest for Pure Flame — puts a quest counter on itself
2. Soul-Scar Mage — puts that many counters on a permanent
3. Fear of Burning Alive — deals that amount damage
4. Niv-Mizzet, Visionary — draws you that many cards
5. Chandra's Incinerator — deals that much damage
6. Chandra's Pyreling — gets +1/+0
7. Talon of Pain — puts a charge counter on itself
8. Asgardian Inspiration — returns itself from the graveyard
9. Thor, Guardian of Midgard — exiles a card from your library
10. Virtue of Courage // Embereth Blaze — exiles a card from your library

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

life is lost — 3,160 cards in the game can cause this (Firestorm is one).

When Firestorm makes a player lose life:

1. Far Fortune, End Boss — raises your speed
2. Zahur, Glory's Past — raises your speed
3. Mendicant Core, Guidelight — raises your speed
4. Aether Syphon — raises your speed
5. Vnwxt, Verbose Host — raises your speed
6. Embalmed Ascendant — raises your speed
7. Slick Imitator — raises your speed
8. Oath of Lim-Dûl — sacrifices an enchantment
9. Marina Vendrell's Grimoire — triggers
10. Lich's Mastery — triggers

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

an instant is cast — 3,931 cards in the game can cause this (Firestorm is one).

When Firestorm is cast:

1. Tomik, Izzet Sparkmage — gets +1/+1
2. Tor Wauki the Younger — deals 2 damage
3. Lunar Mystic — draws you 1 card
4. Ojer Pakpatiq, Deepest Epoch // Temple of Cyclical Time — grants rebound
5. Repeated Reverberation — copies an ability
6. Riku of Two Reflections — copies a spell
7. Sword of Wealth and Power — copies a spell
8. Lilah, Undefeated Slickshot — gets +1/+1
9. Artist's Talent — draws and discards
10. In the Eye of Chaos — counters a spell

427 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 (Firestorm is one).

1. Samwise Gamgee — Firestorm puts cards into the graveyard that Samwise Gamgee can bring back
2. Bloodbond March — Firestorm puts cards into the graveyard that Bloodbond March can bring back
3. Transplant Theorist — Firestorm puts cards into the graveyard that Transplant Theorist can bring back
4. Heart-Shaped Herb — Firestorm puts cards into the graveyard that Heart-Shaped Herb can bring back
5. Wayward Angel — Firestorm fills your graveyard toward the 7 or more cards Wayward Angel needs
6. Rescue from the Underworld — Firestorm puts cards into the graveyard that Rescue from the Underworld can bring back
7. Victimize — Firestorm puts cards into the graveyard that Victimize can bring back
8. Bound // Determined — Firestorm puts cards into the graveyard that Bound // Determined can bring back
9. Enlightened Confidant — Firestorm puts cards into the graveyard that Enlightened Confidant can bring back
10. Tergrid, God of Fright // Tergrid's Lantern — Firestorm puts cards into the graveyard that Tergrid, God of Fright // Tergrid's Lantern can bring back

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 (Firestorm is one).

When a card hits the graveyard thanks to Firestorm:

1. Quest for Ancient Secrets — puts a quest counter on itself
2. Planar Void — hits a graveyard
3. Measure of Wickedness — gives an opponent control of itself
4. Energy Field — sacrifices itself

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

anything is dealt damage — 19,812 cards in the game can cause this (Firestorm is one).

When Firestorm is dealt damage:

1. Massacre Girl, Most Wanted — puts a +1/+1 counter on itself
2. War Elemental — puts that many +1/+1 counters on itself
3. Darien, King of Kjeldor — makes that many tokens
4. Swarmborn Giant — sacrifices itself
5. Risona, Asari Commander — triggers
6. Azor's Elocutors — triggers

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