Heartflame Duelist // Heartflame Slash

an Adventure instant is cast — 61 cards in the game can cause this (Heartflame Duelist is one).

1. Lucky Clover — When Heartflame Duelist // Heartflame Slash is cast, Lucky Clover copies a spell

a Knight attacks — 547 cards in the game can cause this (Heartflame Duelist is one).

1. Knights' Charge — When Heartflame Duelist // Heartflame Slash attacks, Knights' Charge makes each opponent lose 1 life

a Knight deals combat damage — 547 cards in the game can cause this (Heartflame Duelist is one).

1. Exsanguinator Cavalry — When Heartflame Duelist // Heartflame Slash deals combat damage, Exsanguinator Cavalry puts a counter on a permanent

a Knight enters the battlefield — 592 cards in the game can cause this (Heartflame Duelist is one).

When Heartflame Duelist // Heartflame Slash enters:

1. Brimstone Trebuchet — untaps itself
2. Zhalfirin Lancer — gets +1/+1

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

When Heartflame Duelist // Heartflame Slash 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 (Heartflame Duelist is one).

When Heartflame Duelist // Heartflame Slash 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 (Heartflame Duelist is one).

When Heartflame Duelist // Heartflame Slash 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 Human enters the battlefield — 4,639 cards in the game can cause this (Heartflame Duelist is one).

When Heartflame Duelist // Heartflame Slash enters:

1. General Kudro of Drannith — hits a graveyard
2. Heronblade Elite — puts a +1/+1 counter on itself
3. Kyler, Sigardian Emissary — puts a +1/+1 counter on itself
4. Thalia's Lieutenant — puts a +1/+1 counter on itself
5. Champion of the Parish — puts a +1/+1 counter on itself
6. Captain of the Mists — untaps itself
7. Erkenbrand, Lord of Westfold — gives +1/+0
8. Beregond of the Guard — gives +1/+1
9. Théoden, King of Rohan — grants double strike
10. Lossarnach Captain — taps a creature an opponent controls

2 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 (Heartflame Duelist is one).

When Heartflame Duelist // Heartflame Slash attacks:

1. Anthem of Rakdos — gives +2/+0
2. Adaptive Omnitool — searches a library
3. Saw — sacrifices a creature

193 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 (Heartflame Duelist is one).

When Heartflame Duelist // Heartflame Slash attacks:

1. Temmet, Naktamun's Will — draws you 1 card
2. Invisible Woman — triggers
3. Caesar, Legion's Emperor — sacrifices a creature
4. Guide of Souls — triggers

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

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

When Heartflame Duelist // Heartflame Slash enters:

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

321 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 (Heartflame Duelist is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When Heartflame Duelist // Heartflame Slash enters, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself

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