Forerunner of the Heralds

a Scout deals combat damage — 353 cards in the game can cause this (Forerunner of the Heralds is one).

1. Vaan, Street Thief — When Forerunner of the Heralds deals combat damage, Vaan, Street Thief exiles a card from a library

a Merfolk deals combat damage — 386 cards in the game can cause this (Forerunner of the Heralds is one).

1. Seafloor Oracle — When Forerunner of the Heralds deals combat damage, Seafloor Oracle draws you 1 card

a Merfolk enters the battlefield — 397 cards in the game can cause this.

1. Deeproot Elite — When Forerunner of the Heralds enters, Deeproot Elite puts a counter on a Merfolk
2. River Sneak — When Forerunner of the Heralds enters, River Sneak gets +1/+1
3. Deeproot Champion — When Deeproot Champion enters, Forerunner of the Heralds puts a +1/+1 counter on itself
4. Tributary Instructor — When Tributary Instructor enters, Forerunner of the Heralds puts a +1/+1 counter on itself
5. Deeproot Wayfinder — When Deeproot Wayfinder enters, Forerunner of the Heralds puts a +1/+1 counter on itself
6. World Shaper — When World Shaper enters, Forerunner of the Heralds puts a +1/+1 counter on itself
7. A Killer Among Us — When a Merfolk enters thanks to A Killer Among Us, Forerunner of the Heralds puts a +1/+1 counter on itself
8. Jungleborn Pioneer — When a Merfolk enters thanks to Jungleborn Pioneer, Forerunner of the Heralds puts a +1/+1 counter on itself
9. Sentinel of the Nameless City — When Sentinel of the Nameless City enters, Forerunner of the Heralds puts a +1/+1 counter on itself
10. Topography Tracker — When Topography Tracker enters, Forerunner of the Heralds puts a +1/+1 counter on itself
11. Jungle Delver — When Jungle Delver enters, Forerunner of the Heralds puts a +1/+1 counter on itself
12. Nev, the Practical Dean — When Nev, the Practical Dean enters, Forerunner of the Heralds puts a +1/+1 counter on itself

18 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 (Forerunner of the Heralds is one).

When Forerunner of the Heralds gets a counter:

1. Hollowmurk Siege — draws you 1 card
2. Ant-Man, Colony Commander — makes a token
3. Earth Kingdom General — gains you that much life
4. Casey Jones, Back Alley Brute — deals that much damage
5. Generous Patron — draws you 1 card
6. Shalai and Hallar — deals that much damage
7. Danny Pink — draws you 1 card
8. Enduring Scalelord — puts a +1/+1 counter on itself
9. Bold Plagiarist — puts counters on a permanent
10. Mikey & Leo, Chaos & Order — draws you 1 card

33 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 (Forerunner of the Heralds is one).

1. All Will Be One — When Forerunner of the Heralds gets a counter, 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 (Forerunner of the Heralds is one).

When Forerunner of the Heralds attacks:

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

114 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 (Forerunner of the Heralds is one).

When Forerunner of the Heralds 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. Anim Pakal, Thousandth Moon — puts a +1/+1 counter on itself
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

180 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 (Forerunner of the Heralds is one).

When Forerunner of the Heralds 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. Favor of the Woods — gains you 3 life
7. Tide of War — sacrifices a creature
8. Dead-Iron Sledge — kills a creature
9. Dwindle — kills a creature
10. Shield of the Righteous — triggers

18 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 (Forerunner of the Heralds is one).

When Forerunner of the Heralds attacks:

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

a creature deals combat damage — 17,934 cards in the game can cause this (Forerunner of the Heralds is one).

When Forerunner of the Heralds deals combat damage:

1. Locutus of Borg — makes a token
2. Antagonist Incorporator — makes a token

196 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 (Forerunner of the Heralds is one).

When Forerunner of the Heralds 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. Ray Fillet, Wave Warrior — puts a counter on itself
6. The Neutrinos — gets +1/+0
7. Wingnut, Bat on the Belfry — grants flying, haste and menace
8. Aetherstorm Roc — puts a counter on a permanent you control
9. Raphael, Most Attitude — exiles a card from your library

298 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 (Forerunner of the Heralds is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When Forerunner of the Heralds enters, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself

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