edhseer Commander synergy, explained
Sorcery
Mana cost: {3}{U/B}
If {U} was spent to cast this spell, return up to one target creature to its owner's hand. If {B} was spent to cast this spell, target player reveals their hand, you choose a nonland card from it, then that player discards that card.
on-cast — bounce
on-cast —
Causes: a creature leaves the battlefield, discard a card.
Cares about: nothing.
a card is discarded — 2,042 cards in the game can cause this (River's Grasp is one).
When River's Grasp makes a player discard a card:
51 other cards care about it too. These are the ones with the most connections.
a sorcery is cast — 3,720 cards in the game can cause this (River's Grasp is one).
When River's Grasp is cast:
424 other cards care about it too. These are the ones with the most connections.
a nontoken creature leaves the battlefield — 4,133 cards in the game can cause this (River's Grasp is one).
3 other cards care about it too. These are the ones with the most connections.
a creature leaves the battlefield — 4,238 cards in the game can cause this (River's Grasp is one).
When a creature leaves the battlefield thanks to River's Grasp:
25 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 (River's Grasp is one).
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 (River's Grasp is one).
When a card hits the graveyard thanks to River's Grasp:
2 other cards care about it too. These are the ones with the most connections.
anything is cast — 31,128 cards in the game can cause this (River's Grasp is one).
When River's Grasp is cast:
5 other cards care about it too. These are the ones with the most connections.