Cavern Whisperer

a Nightmare enters the battlefield — 151 cards in the game can cause this (Cavern Whisperer is one).

1. Umbris, Fear Manifest — When Cavern Whisperer enters, Umbris, Fear Manifest exiles a card from an opponent's library

a card is discarded — 2,042 cards in the game can cause this (Cavern Whisperer is one).

When a permanent makes a player discard a card thanks to Cavern Whisperer:

1. Sangromancer — gains you 3 life
2. Lo and Li, Royal Advisors — puts a counter on an Advisor
3. Nath of the Gilt-Leaf — makes a token
4. Tourach, Dread Cantor — puts a +1/+1 counter on itself
5. Tinybones, Pocket Nuisance — deals 1 damage
6. Tinybones, Bauble Burglar — hits a graveyard
7. Fell Specter — makes each opponent lose 2 life
8. Spirit Cairn — makes a token
9. Confessor — gains you 1 life
10. Hostile Investigator — triggers

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

a card in a graveyard — 7,589 cards in the game can cause this (Cavern Whisperer is one).

1. Bloodbond March — Cavern Whisperer puts cards into the graveyard that Bloodbond March can bring back
2. Heart-Shaped Herb — Cavern Whisperer puts cards into the graveyard that Heart-Shaped Herb can bring back
3. Enlightened Confidant — Cavern Whisperer puts cards into the graveyard that Enlightened Confidant can bring back
4. Tergrid, God of Fright // Tergrid's Lantern — Cavern Whisperer puts cards into the graveyard that Tergrid, God of Fright // Tergrid's Lantern can bring back
5. Grazing Kelpie — Cavern Whisperer puts cards into the graveyard that Grazing Kelpie can bring back
6. Dauthi Voidwalker — Cards Cavern Whisperer would put into an opponent's graveyard are exiled by Dauthi Voidwalker instead, and it can play from among them
7. Endurance — Cavern Whisperer puts cards into the graveyard that Endurance can bring back
8. Thieves' Guild Enforcer — Cavern Whisperer fills an opponent's graveyard toward the 8 or more cards Thieves' Guild Enforcer needs
9. Soaring Thought-Thief — Cavern Whisperer fills an opponent's graveyard toward the 8 or more cards Soaring Thought-Thief needs
10. Merfolk Windrobber — Cavern Whisperer fills an opponent's graveyard toward the 8 or more cards Merfolk Windrobber needs

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

anything goes to a graveyard — 7,589 cards in the game can cause this (Cavern Whisperer is one).

When a card hits the graveyard thanks to Cavern Whisperer:

1. The Haunt of Hightower — puts a +1/+1 counter on itself
2. Duskmantle Guildmage — makes each opponent lose 1 life
3. Vulturous Zombie — puts a +1/+1 counter on itself
4. Bloodchief Ascension — makes each opponent lose 2 life
5. Compost — draws you 1 card
6. Planar Void — hits a graveyard

5 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 (Cavern Whisperer is one).

When Cavern Whisperer attacks:

1. Far Fortune, End Boss — deals 1 damage
2. Temmet, Naktamun's Will — draws you 1 card
3. Inti, Seneschal of the Sun — triggers
4. Cool but Rude — draws and discards
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

117 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 (Cavern Whisperer is one).

When Cavern Whisperer 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. Jolene, Plundering Pugilist — makes a token
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

189 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 (Cavern Whisperer is one).

When Cavern Whisperer 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

26 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 (Cavern Whisperer is one).

1. Mardu Ascendancy — When Cavern Whisperer attacks, Mardu Ascendancy makes a token

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

a nontoken creature enters the battlefield — 18,448 cards in the game can cause this (Cavern Whisperer is one).

1. Samwise Gamgee — When Cavern Whisperer enters, Samwise Gamgee makes a token

32 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 (Cavern Whisperer is one).

When Cavern Whisperer enters:

1. Slash, Reptile Rampager — deals 2 damage
2. Ray Fillet, Wave Warrior — puts a counter on itself
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

344 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 (Cavern Whisperer is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When Cavern Whisperer enters, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself

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