River Serpent

hits creature — 2,298 cards in the game can cause this.

1. Jalira, Master Polymorphist — Jalira, Master Polymorphist can put River Serpent onto the battlefield from your library
2. Kethek, Crucible Goliath — Kethek, Crucible Goliath can put River Serpent onto the battlefield from your library
3. Polymorph — Polymorph can put River Serpent onto the battlefield from your library
4. Birthing Ritual — Birthing Ritual can put River Serpent onto the battlefield from your library
5. Industrial Advancement — Industrial Advancement can put River Serpent onto the battlefield from your library
6. Killer Instinct — Killer Instinct can put River Serpent onto the battlefield from your library
7. Arthur, Marigold Knight — Arthur, Marigold Knight can put River Serpent onto the battlefield from your library
8. Proteus Staff — Proteus Staff can put River Serpent onto the battlefield from your library
9. Synthetic Destiny — Synthetic Destiny can put River Serpent onto the battlefield from your library
10. Divergent Transformations — Divergent Transformations can put River Serpent onto the battlefield from your library
11. Mass Polymorph — Mass Polymorph can put River Serpent onto the battlefield from your library

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

a creature is discarded — 206 cards in the game can cause this (River Serpent is one).

When River Serpent makes a player discard a card:

1. Wharf Infiltrator — makes a token
2. Bone Miser — makes a token
3. Hashaton, Scarab's Fist — makes a token
4. Surly Badgersaur — puts a +1/+1 counter on itself
5. Oskar, Rubbish Reclaimer — brings a card back
6. Conspiracy Theorist — brings a card back
7. Veronica, Dissident Scribe — makes a token
8. Green Goblin, Nemesis — puts a counter on a Goblin

1 other card cares about it too. These are the ones with the most connections.

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

When River Serpent makes a player discard a card:

1. Ivora, Insatiable Heir — puts a +1/+1 counter on itself
2. Cool but Rude — deals 2 damage
3. Containment Construct — brings a card back
4. Moonstone, Harsh Mistress — brings a card back
5. Lazotep Chancellor — puts 2 counters on a Zombie or Army
6. Magmakin Artillerist — deals that much damage
7. Inti, Seneschal of the Sun — exiles a card from your library
8. Pitchstone Wall — sacrifices itself
9. Currency Converter — exiles it
10. Hostile Investigator — triggers

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

a creature goes to a graveyard — 3,011 cards in the game can cause this (River Serpent is one).

When River Serpent hits the graveyard:

1. Syr Konrad, the Grim — deals 1 damage
2. Robot Domination — draws you 1 card
3. Voracious Brood — puts that many +1/+1 counters on itself
4. Dennick, Pious Apprentice // Dennick, Pious Apparition — triggers
5. Soulcipher Board // Cipherbound Spirit — triggers
6. Sefris of the Hidden Ways — triggers

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

a card is drawn — 3,815 cards in the game can cause this (River Serpent is one).

When River Serpent makes a player draw a card:

1. Temmet, Naktamun's Will — gives +1/+1
2. Niv-Mizzet, Parun — deals 1 damage
3. Aether Syphon — mills a card
4. The Locust God — makes a token
5. Starving Revenant — makes each opponent lose 1 life
6. Diviner's Wand — gets +1/+1
7. Ominous Seas — puts a foreshadow counter on itself
8. Dream Trawler — gets +1/+0
9. Iron Man, Armored Avenger — puts a counter on a creature
10. The Astonishing Ant-Man — puts a +1/+1 counter on itself

57 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.

1. Gale, Waterdeep Prodigy — When River Serpent is in the graveyard, Gale, Waterdeep Prodigy can bring it back
2. Transplant Theorist — When River Serpent is in the graveyard, Transplant Theorist can bring it back
3. Heart-Shaped Herb — When River Serpent is in the graveyard, Heart-Shaped Herb can bring it back
4. Wayward Angel — River Serpent fills your graveyard toward the 7 or more cards Wayward Angel needs
5. Rescue from the Underworld — When River Serpent is in the graveyard, Rescue from the Underworld can bring it back
6. Victimize — When River Serpent is in the graveyard, Victimize can bring it back
7. Bound // Determined — When River Serpent is in the graveyard, Bound // Determined can bring it back
8. Enlightened Confidant — When River Serpent is in the graveyard, Enlightened Confidant can bring it back
9. Tergrid, God of Fright // Tergrid's Lantern — When River Serpent is in the graveyard, Tergrid, God of Fright // Tergrid's Lantern can bring it back
10. Aerith, Last Ancient — When River Serpent is in the graveyard, Aerith, Last Ancient can bring it back
11. Sage's Row Denizen — Sage's Row Denizen fills your graveyard toward the 5 or more cards River Serpent needs
12. Screaming Swarm — Screaming Swarm fills your graveyard toward the 5 or more cards River Serpent needs
13. Master Pakku — Master Pakku fills your graveyard toward the 5 or more cards River Serpent needs
14. Cruel Witness — Cruel Witness fills your graveyard toward the 5 or more cards River Serpent needs
15. Lightshell Duo — Lightshell Duo fills your graveyard toward the 5 or more cards River Serpent needs
16. Exhibition Tidecaller — Exhibition Tidecaller fills your graveyard toward the 5 or more cards River Serpent needs
17. Cephalid Inkmage — Cephalid Inkmage fills your graveyard toward the 5 or more cards River Serpent needs
18. Sage of Mysteries — Sage of Mysteries fills your graveyard toward the 5 or more cards River Serpent needs
19. Scrabbling Skullcrab — Scrabbling Skullcrab fills your graveyard toward the 5 or more cards River Serpent needs
20. Selhoff Occultist — Selhoff Occultist fills your graveyard toward the 5 or more cards River Serpent needs

552 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 (River Serpent is one).

When River Serpent hits the graveyard:

1. Quest for Ancient Secrets — puts a quest counter on itself
2. Planar Void — hits a graveyard
3. Measure of Wickedness — gives an opponent control of itself
4. Energy Field — sacrifices itself

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

a creature is cast — 18,010 cards in the game can cause this (River Serpent is one).

1. Bloodbond March — When River Serpent is cast, Bloodbond March brings a card back

90 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 (River Serpent is one).

1. Samwise Gamgee — When River Serpent enters, Samwise Gamgee makes a token

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