Mathas, Fiend Seeker

a Vampire attacks — 484 cards in the game can cause this (Mathas is one).

When Mathas, Fiend Seeker attacks:

1. Glass-Cast Heart — makes a token
2. Sanctum Seeker — makes each opponent lose 1 life

a nontoken Vampire attacks — 484 cards in the game can cause this (Mathas is one).

1. Mavren Fein, Dusk Apostle — When Mathas, Fiend Seeker attacks, Mavren Fein, Dusk Apostle makes a token

a Vampire creature is cast — 484 cards in the game can cause this (Mathas is one).

1. Bloodlord of Vaasgoth — When Mathas, Fiend Seeker is cast, Bloodlord of Vaasgoth grants bloodthirst

a Vampire deals combat damage — 484 cards in the game can cause this (Mathas is one).

When Mathas, Fiend Seeker deals combat damage:

1. Rakish Heir — puts a counter on a permanent
2. Stensia Masquerade — puts a counter on a permanent

a Vampire enters the battlefield — 500 cards in the game can cause this (Mathas is one).

When Mathas, Fiend Seeker enters:

1. Anje, Maid of Dishonor — makes a token
2. Forerunner of the Legion — gives +1/+1
3. Markov Enforcer — deals damage
4. Evelyn, the Covetous — exiles a card from a library

life is gained — 2,076 cards in the game can cause this (Mathas is one).

When a permanent gains life thanks to Mathas, Fiend Seeker:

1. Kavu Predator — puts that many +1/+1 counters on itself
2. Punishing Fire — returns itself from the graveyard

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

a creature gets a counter — 2,691 cards in the game can cause this (Mathas is one).

When a creature gets a counter thanks to Mathas, Fiend Seeker:

1. Generous Patron — draws you 1 card
2. Bold Plagiarist — puts counters on a permanent
3. Kros, Defense Contractor — triggers
4. Rikku, Resourceful Guardian — triggers

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

a creature dies — 2,830 cards in the game can cause this.

1. Orthion, Hero of Lavabrink — When a creature dies thanks to Orthion, Hero of Lavabrink, Mathas, Fiend Seeker makes an opponent draw 1 card
2. Ghoulish Procession — When a Zombie dies thanks to Ghoulish Procession, Mathas, Fiend Seeker makes an opponent draw 1 card
3. Curse of the Restless Dead — When a Zombie dies thanks to Curse of the Restless Dead, Mathas, Fiend Seeker makes an opponent draw 1 card
4. The Jolly Balloon Man — When a Balloon dies thanks to The Jolly Balloon Man, Mathas, Fiend Seeker makes an opponent draw 1 card
5. Jadar, Ghoulcaller of Nephalia — When a Zombie dies thanks to Jadar, Ghoulcaller of Nephalia, Mathas, Fiend Seeker makes an opponent draw 1 card
6. Sandstorm Crasher — When a creature dies thanks to Sandstorm Crasher, Mathas, Fiend Seeker makes an opponent draw 1 card
7. Hobbling Zombie — When a Zombie dies thanks to Hobbling Zombie, Mathas, Fiend Seeker makes an opponent draw 1 card
8. Old Hob, Alleycat Blues — When a Mutant dies thanks to Old Hob, Alleycat Blues, Mathas, Fiend Seeker makes an opponent draw 1 card
9. Calamity, Galloping Inferno — When a creature dies thanks to Calamity, Galloping Inferno, Mathas, Fiend Seeker makes an opponent draw 1 card
10. Urabrask's Forge — When a Phyrexian or Horror dies thanks to Urabrask's Forge, Mathas, Fiend Seeker makes an opponent draw 1 card

2,820 other cards cause it too. These are the ones with the most connections.

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

When a permanent makes a player draw a card thanks to Mathas, Fiend Seeker:

1. Ob Nixilis, the Hate-Twisted — deals 1 damage
2. Orcish Bowmasters — deals 1 damage
3. Scrawling Crawler — makes each opponent lose 1 life
4. Xyris, the Writhing Storm — makes a token
5. Fate Unraveler — deals 1 damage
6. Sheoldred, the Apocalypse — makes a player lose 2 life
7. Nekusar, the Mindrazer — deals 1 damage
8. Leela, Sevateem Warrior — puts a +1/+1 counter on itself
9. Razorkin Needlehead — deals 1 damage
10. Consecrated Sphinx — draws you 2 cards

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

anything gets a counter — 4,415 cards in the game can cause this (Mathas is one).

1. All Will Be One — When a creature gets a counter thanks to Mathas, Fiend Seeker, All Will Be One deals that much damage

8 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 (Mathas is one).

When Mathas, Fiend Seeker attacks:

1. Hollowmurk Siege — puts a counter on a creature
2. Temmet, Naktamun's Will — draws you 1 card
3. Far Fortune, End Boss — deals 1 damage
4. Grim Javelineer — gives +1/+0
5. Invisible Woman — triggers
6. Caesar, Legion's Emperor — sacrifices a creature
7. Guide of Souls — triggers
8. Campsite Cuisine — sacrifices a Food
9. Gossip's Talent — triggers
10. Banon, the Returners' Leader — draws and discards

120 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 (Mathas is one).

When Mathas, Fiend Seeker 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. Saw — sacrifices a creature
7. Gisa's Favorite Shovel — makes an opponent sacrifice a creature
8. Ultima Weapon — kills a creature an opponent controls

183 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 (Mathas is one).

When Mathas, Fiend Seeker blocks:

1. Mage Hunters' Onslaught — makes a player lose 1 life
2. Tide of War — sacrifices a creature
3. Dead-Iron Sledge — kills a creature
4. Dwindle — kills a creature

24 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 (Mathas is one).

When Mathas, Fiend Seeker enters:

1. Scurry Oak — puts a counter on itself
2. Fathom Mage — puts a counter on itself
3. Lonis, Genetics Expert — puts a counter on itself
4. Slash, Reptile Rampager — deals 2 damage
5. Gimli of the Glittering Caves — puts counters on a permanent
6. Ray Fillet, Wave Warrior — puts a counter on itself
7. Legolas Greenleaf — puts a counter on a permanent
8. The Neutrinos — gets +1/+0
9. Aetherstorm Roc — puts a counter on a permanent you control
10. Raphael, Most Attitude — exiles a card from your library

309 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 (Mathas is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When Mathas, Fiend Seeker enters, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself

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