The Speed Demon

a Demon enters the battlefield — 284 cards in the game can cause this (The Speed Demon is one).

When The Speed Demon enters:

1. Blood Speaker — returns itself from the graveyard
2. Be'lakor, the Dark Master — deals its power damage

life is lost — 3,160 cards in the game can cause this.

1. The Master of Lake-town — When The Speed Demon makes a player lose life, The Master of Lake-town mills a card
2. Intermediate Chirography — When The Speed Demon makes a player lose life, Intermediate Chirography puts a counter on a creature
3. Vilis, Broker of Blood — When The Speed Demon makes a player lose life, Vilis, Broker of Blood draws you that many cards
4. Vengeful Warchief — When The Speed Demon makes a player lose life, Vengeful Warchief puts a +1/+1 counter on itself
5. Wax-Wane Witness — When The Speed Demon makes a player lose life, Wax-Wane Witness gets +1/+0
6. Brainstealer Dragon — When Brainstealer Dragon makes a player lose life, The Speed Demon raises your speed
7. Glaring Fleshraker — When Glaring Fleshraker makes a player lose life, The Speed Demon raises your speed
8. Lux Artillery — When Lux Artillery makes a player lose life, The Speed Demon raises your speed
9. Poisonbelly Ogre — When a player makes a player lose life thanks to Poisonbelly Ogre, The Speed Demon raises your speed
10. Gideon the Oathless — When Gideon the Oathless makes a player lose life, The Speed Demon raises your speed
11. Blood Seeker — When a permanent makes a player lose life thanks to Blood Seeker, The Speed Demon raises your speed
12. Tinybones Joins Up — When Tinybones Joins Up makes a player lose life, The Speed Demon raises your speed
13. Trespasser's Curse — When Trespasser's Curse makes a player lose life, The Speed Demon raises your speed
14. Jaws of Defeat — When a permanent makes a player lose life thanks to Jaws of Defeat, The Speed Demon raises your speed
15. Binding Agony — When Binding Agony makes a player lose life, The Speed Demon raises your speed
16. Oath of Lim-Dûl — When The Speed Demon makes a player lose life, Oath of Lim-Dûl sacrifices an enchantment
17. Marina Vendrell's Grimoire — When The Speed Demon makes a player lose life, Marina Vendrell's Grimoire triggers
18. Lich's Mastery — When The Speed Demon makes a player lose life, Lich's Mastery triggers
19. Lich's Tomb — When The Speed Demon makes a player lose life, Lich's Tomb sacrifices a permanent
20. Gonti's Machinations — When The Speed Demon makes a player lose life, Gonti's Machinations puts a counter on a permanent you control

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

a card is drawn — 3,815 cards in the game can cause this (The Speed Demon is one).

When The Speed Demon makes a player draw a card:

1. Aether Syphon — mills a card
2. Temmet, Naktamun's Will — gives +1/+1
3. Niv-Mizzet, Parun — deals 1 damage
4. The Locust God — makes a token
5. Starving Revenant — makes each opponent lose 1 life
6. Diviner's Wand — gets +1/+1
7. Ominous Seas — puts a foreshadow counter on itself
8. Dream Trawler — gets +1/+0
9. Iron Man, Armored Avenger — puts a counter on a creature
10. The Astonishing Ant-Man — puts a +1/+1 counter on itself

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

anything attacks — 17,934 cards in the game can cause this (The Speed Demon is one).

When The Speed Demon attacks:

1. Far Fortune, End Boss — deals 1 damage
2. Grim Javelineer — gives +1/+0
3. Invisible Woman — triggers
4. Caesar, Legion's Emperor — sacrifices a creature
5. Guide of Souls — triggers
6. Campsite Cuisine — sacrifices a Food
7. Gossip's Talent — triggers
8. Banon, the Returners' Leader — draws and discards
9. Toph, Earthbending Master — puts a counter on a permanent
10. Three Dog, Galaxy News DJ — sacrifices an Aura

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

a creature attacks — 17,934 cards in the game can cause this (The Speed Demon is one).

When The Speed Demon attacks:

1. Adaptive Omnitool — searches a library
2. Anthem of Rakdos — gives +2/+0
3. Kindred Discovery — draws you 1 card
4. Invasion of New Capenna // Holy Frazzle-Cannon — puts counters on a permanent
5. Chorale of the Void — brings a card back
6. Jolene, Plundering Pugilist — makes a token
7. Saw — sacrifices a creature
8. Gisa's Favorite Shovel — makes an opponent sacrifice a creature
9. Ultima Weapon — kills a creature an opponent controls
10. Total War — kills a creature

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

a creature blocks — 17,934 cards in the game can cause this (The Speed Demon is one).

When The Speed Demon blocks:

1. Mage Hunters' Onslaught — makes a player lose 1 life
2. Carnage Gladiator — makes a player lose 1 life
3. Tide of War — sacrifices a creature
4. Dead-Iron Sledge — kills a creature
5. Dwindle — kills a creature
6. Shield of the Righteous — triggers

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

a nontoken creature attacks — 17,934 cards in the game can cause this (The Speed Demon is one).

When The Speed Demon attacks:

1. Mardu Ascendancy — makes a token
2. Basri Ket — makes a token
3. Militia's Pride — makes a token

a creature enters the battlefield — 19,800 cards in the game can cause this (The Speed Demon is one).

When The Speed Demon enters:

1. Slash, Reptile Rampager — deals 2 damage
2. Gimli of the Glittering Caves — puts counters on a permanent
3. Ray Fillet, Wave Warrior — puts a counter on itself
4. Legolas Greenleaf — puts a counter on a permanent
5. The Neutrinos — gets +1/+0
6. Wingnut, Bat on the Belfry — grants flying, haste and menace
7. Aetherstorm Roc — puts a counter on a permanent you control
8. Raphael, Most Attitude — exiles a card from your library

303 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 (The Speed Demon is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When The Speed Demon enters, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself

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