Merfolk Secretkeeper // Venture Deeper

an Adventure sorcery is cast — 77 cards in the game can cause this (Merfolk Secretkeeper is one).

1. Lucky Clover — When Merfolk Secretkeeper // Venture Deeper is cast, Lucky Clover copies a spell

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

1. Seafloor Oracle — When Merfolk Secretkeeper // Venture Deeper deals combat damage, Seafloor Oracle draws you 1 card

a Merfolk enters the battlefield — 397 cards in the game can cause this (Merfolk Secretkeeper is one).

When Merfolk Secretkeeper // Venture Deeper enters:

1. Forerunner of the Heralds — puts a +1/+1 counter on itself
2. Deeproot Elite — puts a counter on a Merfolk
3. River Sneak — gets +1/+1

a card is milled — 772 cards in the game can cause this (Merfolk Secretkeeper is one).

1. Lo and Li, Royal Advisors — When Merfolk Secretkeeper // Venture Deeper makes a player mill a card, Lo and Li, Royal Advisors puts a counter on an Advisor

a nontoken Wizard enters the battlefield — 1,243 cards in the game can cause this (Merfolk Secretkeeper is one).

1. Inalla, Archmage Ritualist — When Merfolk Secretkeeper // Venture Deeper enters, Inalla, Archmage Ritualist makes a token

a Wizard creature enters the battlefield — 1,264 cards in the game can cause this (Merfolk Secretkeeper is one).

1. Diviner's Wand — When Merfolk Secretkeeper // Venture Deeper enters, Diviner's Wand triggers

a sorcery is cast — 3,720 cards in the game can cause this (Merfolk Secretkeeper is one).

When Merfolk Secretkeeper // Venture Deeper is cast:

1. Spellweaver Volute — copies a spell
2. Lilah, Undefeated Slickshot — gets +1/+1
3. Niblis of Frost — gets +1/+1
4. Primeval Bounty — puts 3 counters on a creature
5. Tetsuko Umezawa, Pursuer — gets +1/+1
6. Thor, God of Thunder — deals that spell's mana value damage
7. Krile Baldesion — brings a card back
8. Summon: Good King Mog XII — makes a token
9. Kykar, Wind's Fury — makes a token
10. Blood Funnel — sacrifices a creature

424 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 (Merfolk Secretkeeper is one).

Merfolk Secretkeeper // Venture Deeper:

1. Gale, Waterdeep Prodigy — puts cards into the graveyard that Gale, Waterdeep Prodigy can bring back
2. Harness the Storm — puts cards into the graveyard that Harness the Storm can bring back
3. Samwise Gamgee — puts cards into the graveyard that Samwise Gamgee can bring back
4. Fire Nation Salvagers — puts cards into the graveyard that Fire Nation Salvagers can bring back
5. Bloodbond March — puts cards into the graveyard that Bloodbond March can bring back
6. Transplant Theorist — puts cards into the graveyard that Transplant Theorist can bring back
7. Heart-Shaped Herb — puts cards into the graveyard that Heart-Shaped Herb can bring back
8. Wayward Angel — fills your graveyard toward the 7 or more cards Wayward Angel needs
9. Rescue from the Underworld — puts cards into the graveyard that Rescue from the Underworld can bring back
10. Victimize — puts cards into the graveyard that Victimize can bring back

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 (Merfolk Secretkeeper is one).

When a card hits the graveyard thanks to Merfolk Secretkeeper // Venture Deeper:

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. Quest for Ancient Secrets — puts a quest counter on itself
5. Bloodchief Ascension — makes each opponent lose 2 life
6. Compost — draws you 1 card
7. Planar Void — hits a graveyard
8. Measure of Wickedness — gives an opponent control of itself
9. Energy Field — sacrifices itself

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 (Merfolk Secretkeeper is one).

When Merfolk Secretkeeper // Venture Deeper 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

124 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 (Merfolk Secretkeeper is one).

When Merfolk Secretkeeper // Venture Deeper attacks:

1. Adaptive Omnitool — searches a library
2. Anthem of Rakdos — gives +2/+0
3. Kindred Discovery — draws you 1 card
4. Saw — sacrifices a creature

199 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 (Merfolk Secretkeeper is one).

1. Tide of War — When Merfolk Secretkeeper // Venture Deeper blocks, Tide of War sacrifices a creature

29 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 (Merfolk Secretkeeper is one).

1. Riku of Two Reflections — When Merfolk Secretkeeper // Venture Deeper enters, Riku of Two Reflections 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 (Merfolk Secretkeeper is one).

When Merfolk Secretkeeper // Venture Deeper enters:

1. Pollywog Prodigy — puts a counter on itself
2. Slash, Reptile Rampager — deals 2 damage
3. Ray Fillet, Wave Warrior — puts a counter on itself
4. The Neutrinos — gets +1/+0
5. Wingnut, Bat on the Belfry — grants flying, haste and menace
6. Aetherstorm Roc — puts a counter on a permanent you control
7. Raphael, Most Attitude — exiles a card from your library

367 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 (Merfolk Secretkeeper is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When Merfolk Secretkeeper // Venture Deeper enters, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself

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