Mathas, Fiend Seeker

a Vampire attacks — 425 cards in Mathas's colors 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 — 425 cards in Mathas's colors 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 — 425 cards in Mathas's colors 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 — 425 cards in Mathas's colors 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 — 441 cards in Mathas's colors 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

life is gained — 1,434 cards in Mathas's colors can cause this (Mathas is one).

1. Punishing Fire — When a permanent gains life thanks to Mathas, Fiend Seeker, Punishing Fire returns itself from the graveyard

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

a creature gets a counter — 1,343 cards in Mathas's colors can cause this (Mathas is one).

1. Bold Plagiarist — When a creature gets a counter thanks to Mathas, Fiend Seeker, Bold Plagiarist puts counters on a permanent

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

a creature dies — 2,141 cards in Mathas's colors 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

2,131 other cards cause it too. These are the ones with the most connections.

a card is drawn — 1,579 cards in Mathas's colors 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. Fate Unraveler — deals 1 damage
5. Sheoldred, the Apocalypse — makes a player lose 2 life
6. Razorkin Needlehead — deals 1 damage
7. Mind's Eye — draws you 1 card
8. Smothering Tithe — makes a token
9. Curse of Fool's Wisdom — makes a player lose 2 life
10. Spiteful Visions — deals 1 damage

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

anything gets a counter — 2,286 cards in Mathas's colors 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

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

anything attacks — 9,901 cards in Mathas's colors can cause this (Mathas is one).

When Mathas, Fiend Seeker attacks:

1. Far Fortune, End Boss — deals 1 damage
2. Grim Javelineer — gives +1/+0
3. ED-E, Lonesome Eyebot — puts a quest counter on itself
4. Surgical Suite // Hospital Room — puts a counter on a creature
5. Caesar, Legion's Emperor — sacrifices a creature
6. Guide of Souls — triggers
7. Banon, the Returners' Leader — draws and discards
8. Three Dog, Galaxy News DJ — sacrifices an Aura
9. Inti, Seneschal of the Sun — triggers
10. Gut, True Soul Zealot — sacrifices a creature or artifact

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

a creature attacks — 9,901 cards in Mathas's colors 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. Invasion of New Capenna // Holy Frazzle-Cannon — puts counters on a permanent
4. Chorale of the Void — brings a card back
5. Anim Pakal, Thousandth Moon — puts a +1/+1 counter on itself
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
9. Total War — kills a creature
10. The Spear of Leonidas — triggers

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

a creature blocks — 9,901 cards in Mathas's colors can cause this (Mathas is one).

When Mathas, Fiend Seeker blocks:

1. Mage Hunters' Onslaught — makes a player lose 1 life
2. Carnage Gladiator — makes a player lose 1 life
3. Barrow-Blade — strips abilities
4. Heat of Battle — deals 1 damage
5. Battle Strain — deals 1 damage
6. Noble Stand — gains you 2 life
7. Tide of War — sacrifices a creature
8. Dead-Iron Sledge — kills a creature

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

a nontoken creature attacks — 9,901 cards in Mathas's colors can cause this (Mathas is one).

When Mathas, Fiend Seeker 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 — 11,072 cards in Mathas's colors can cause this (Mathas is one).

When Mathas, Fiend Seeker enters:

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

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

anything enters the battlefield — 15,360 cards in Mathas's colors 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

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