Howlpack Piper // Wildsong Howler

a Werewolf enters the battlefield — 134 cards in the game can cause this (Howlpack Piper is one).

1. Geier Reach Bandit // Vildin-Pack Alpha — When Howlpack Piper // Wildsong Howler enters, Geier Reach Bandit // Vildin-Pack Alpha triggers

a creature untaps — 519 cards in the game can cause this (Howlpack Piper is one).

1. Fishing Pole — When Howlpack Piper // Wildsong Howler untaps, Fishing Pole triggers

a Human enters the battlefield — 4,639 cards in the game can cause this (Howlpack Piper is one).

When Howlpack Piper // Wildsong Howler 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.

anything attacks — 17,934 cards in the game can cause this (Howlpack Piper is one).

When Howlpack Piper // Wildsong Howler 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

111 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 (Howlpack Piper is one).

When Howlpack Piper // Wildsong Howler 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

181 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 (Howlpack Piper is one).

When Howlpack Piper // Wildsong Howler blocks:

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

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

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

1. Primo, the Unbounded — When Howlpack Piper // Wildsong Howler deals combat damage, Primo, the Unbounded makes a token

197 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 (Howlpack Piper is one).

When Howlpack Piper // Wildsong Howler attacks:

1. Mardu Ascendancy — makes a token
2. Basri Ket — makes a token

1 other card cares 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 (Howlpack Piper is one).

1. Fire Nation Salvagers — When Fire Nation Salvagers enters thanks to Howlpack Piper // Wildsong Howler, it puts a counter on a creature or Vehicle
2. Goblin Goliath — When Goblin Goliath enters thanks to Howlpack Piper // Wildsong Howler, it makes a token
3. Slash, Reptile Rampager — When a creature enters thanks to Howlpack Piper // Wildsong Howler, Slash, Reptile Rampager deals 2 damage
4. The Neutrinos — When a creature enters thanks to Howlpack Piper // Wildsong Howler, The Neutrinos gets +1/+0
5. Wingnut, Bat on the Belfry — When a creature enters thanks to Howlpack Piper // Wildsong Howler, Wingnut, Bat on the Belfry grants flying, haste and menace
6. Shadow Puppeteers — When Shadow Puppeteers enters thanks to Howlpack Piper // Wildsong Howler, it makes 2 tokens
7. Tenured Inkcaster — When Tenured Inkcaster enters thanks to Howlpack Piper // Wildsong Howler, it puts a counter on a creature
8. Aetherstorm Roc — When a creature enters thanks to Howlpack Piper // Wildsong Howler, Aetherstorm Roc puts a counter on a permanent you control
9. Raphael, Most Attitude — When a creature enters thanks to Howlpack Piper // Wildsong Howler, Raphael, Most Attitude exiles a card from your library
10. Clandestine Meddler — When Clandestine Meddler enters thanks to Howlpack Piper // Wildsong Howler, it triggers

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 (Howlpack Piper is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When a creature enters thanks to Howlpack Piper // Wildsong Howler, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself
2. Ivora, Insatiable Heir — When Ivora, Insatiable Heir enters thanks to Howlpack Piper // Wildsong Howler, it makes a token
3. Dogmeat, Ever Loyal — When Dogmeat, Ever Loyal enters thanks to Howlpack Piper // Wildsong Howler, it mills a card
4. The Earth King — When The Earth King enters thanks to Howlpack Piper // Wildsong Howler, it makes a token
5. SP//dr, Piloted by Peni — When SP//dr, Piloted by Peni enters thanks to Howlpack Piper // Wildsong Howler, it puts a counter on a creature
6. Mu Yanling, Wind Rider — When Mu Yanling, Wind Rider enters thanks to Howlpack Piper // Wildsong Howler, it makes a token
7. The Rani — When The Rani enters thanks to Howlpack Piper // Wildsong Howler, it makes a token
8. Ellivere of the Wild Court — When Ellivere of the Wild Court enters thanks to Howlpack Piper // Wildsong Howler, it makes a token
9. J. Jonah Jameson — When J. Jonah Jameson enters thanks to Howlpack Piper // Wildsong Howler, it triggers
10. Ultimecia, Temporal Threat — When Ultimecia, Temporal Threat enters thanks to Howlpack Piper // Wildsong Howler, it taps a creature an opponent controls

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