Haldan, Avid Arcanist

a land is played — 14 cards in Haldan's colors can cause this (Haldan is one).

When a land plays a land thanks to Haldan, Avid Arcanist:

1. The Endstone — draws you 1 card
2. Horn of Greed — makes a player draw 1 card
3. City of Traitors — sacrifices itself

a battle is cast — 20 cards in Haldan's colors can cause this (Haldan is one).

1. Defiler of Dreams — When Haldan, Avid Arcanist is cast, Defiler of Dreams draws you 1 card
2. Hermes, Overseer of Elpis — When an artifact is cast thanks to Haldan, Avid Arcanist, Hermes, Overseer of Elpis makes a token
3. The Fantasticar — When an artifact is cast thanks to Haldan, Avid Arcanist, The Fantasticar turns something into a creature
4. Variable Chaser // Arc of Fortune — When an artifact is cast thanks to Haldan, Avid Arcanist, Variable Chaser // Arc of Fortune gets +1/+1
5. Shark Typhoon — When an artifact is cast thanks to Haldan, Avid Arcanist, Shark Typhoon makes a token
6. Lieutenant Commander Data — When an artifact is cast thanks to Haldan, Avid Arcanist, Lieutenant Commander Data puts a +1/+1 counter on itself
7. Drake Hatcher — When an artifact is cast thanks to Haldan, Avid Arcanist, Drake Hatcher gets +1/+1
8. Machine Man, Model X-51 — When an artifact is cast thanks to Haldan, Avid Arcanist, Machine Man, Model X-51 puts a +1/+1 counter on itself
9. Traxos, Academy Guardian — When an artifact is cast thanks to Haldan, Avid Arcanist, Traxos, Academy Guardian gets +1/+1
10. The Vision — When an artifact is cast thanks to Haldan, Avid Arcanist, The Vision triggers

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

a planeswalker is cast — 56 cards in Haldan's colors can cause this (Haldan is one).

1. Interplanar Beacon — When a planeswalker is cast thanks to Haldan, Avid Arcanist, Interplanar Beacon gains you 1 life

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

a Wizard creature enters the battlefield — 566 cards in Haldan's colors can cause this (Haldan is one).

1. Diviner's Wand — When Haldan, Avid Arcanist enters, Diviner's Wand triggers

an artifact is cast — 2,506 cards in Haldan's colors can cause this (Haldan is one).

When an artifact is cast thanks to Haldan, Avid Arcanist:

1. Sai, Master Thopterist — makes a token
2. Mirrodin Besieged — makes a token
3. Riddlesmith — draws you 1 card
4. Patchwork Automaton — puts a +1/+1 counter on itself
5. Iron Man, Bleeding Edge — copies a spell
6. Golem Foundry — puts a charge counter on itself
7. Efficient Construction — makes a token
8. Vedalken Archmage — draws you 1 card
9. Mirran Spy — untaps a permanent
10. Forensic Gadgeteer — triggers

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

a sorcery is cast — 581 cards in Haldan's colors can cause this (Haldan is one).

1. Spellweaver Volute — When a sorcery is cast thanks to Haldan, Avid Arcanist, Spellweaver Volute copies a spell
2. Sword of Wealth and Power — When an instant is cast thanks to Haldan, Avid Arcanist, Sword of Wealth and Power copies a spell
3. Metallurgic Summonings — When an instant is cast thanks to Haldan, Avid Arcanist, Metallurgic Summonings makes a token
4. Poppet Stitcher // Poppet Factory — When an instant is cast thanks to Haldan, Avid Arcanist, Poppet Stitcher // Poppet Factory makes a token
5. Deekah, Fractal Theorist — When an instant is cast thanks to Haldan, Avid Arcanist, Deekah, Fractal Theorist makes a token
6. Muse Seeker — When an instant is cast thanks to Haldan, Avid Arcanist, Muse Seeker draws you 1 card
7. Murmuring Mystic — When an instant is cast thanks to Haldan, Avid Arcanist, Murmuring Mystic makes a token
8. Talrand, Sky Summoner — When an instant is cast thanks to Haldan, Avid Arcanist, Talrand, Sky Summoner makes a token
9. Docent of Perfection // Final Iteration — When an instant is cast thanks to Haldan, Avid Arcanist, Docent of Perfection // Final Iteration makes a token
10. Thunderclap Drake — When an instant is cast thanks to Haldan, Avid Arcanist, Thunderclap Drake sacrifices itself

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

an instant is cast — 967 cards in Haldan's colors can cause this (Haldan is one).

When an instant is cast thanks to Haldan, Avid Arcanist:

1. Lunar Mystic — draws you 1 card
2. In the Eye of Chaos — counters a spell

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

a Human enters the battlefield — 634 cards in Haldan's colors can cause this (Haldan is one).

1. Captain of the Mists — When Haldan, Avid Arcanist enters, Captain of the Mists untaps itself

a creature attacks — 3,238 cards in Haldan's colors can cause this (Haldan is one).

When Haldan, Avid Arcanist attacks:

1. Adaptive Omnitool — searches a library
2. Kindred Discovery — draws you 1 card
3. Screaming Swarm — mills a card
4. Imperious Mindbreaker — mills a card
5. Staff of Titania — makes a token
6. Inquisitorial Rosette — makes a token
7. Andúril, Flame of the West — makes 2 tokens
8. Saw — sacrifices a creature
9. Ultima Weapon — kills a creature an opponent controls
10. Throwing Knife — sacrifices itself

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

anything attacks — 3,238 cards in Haldan's colors can cause this (Haldan is one).

When Haldan, Avid Arcanist attacks:

1. ED-E, Lonesome Eyebot — puts a quest counter on itself
2. Madame Web, Clairvoyant — mills a card
3. Dawnsire, Sunstar Dreadnought — deals 100 damage
4. Gossip's Talent — triggers
5. Alora, Merry Thief — triggers
6. Twins of Discord — triggers
7. Great Gilded Boat — draws and discards
8. Cosmic Cube — triggers

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

a creature blocks — 3,238 cards in Haldan's colors can cause this (Haldan is one).

When Haldan, Avid Arcanist blocks:

1. Dead-Iron Sledge — kills a creature
2. Dwindle — kills a creature

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

a creature enters the battlefield — 3,581 cards in Haldan's colors can cause this (Haldan is one).

When Haldan, Avid Arcanist enters:

1. Pollywog Prodigy — puts a counter on itself
2. Ray Fillet, Wave Warrior — puts a counter on itself

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