edhseer Commander synergy, explained
Sorcery
Mana cost: {4}{U}{U}
Return all nonland permanents target player controls to their owner's hand.
on-cast — bounce
Causes: an artifact leaves the battlefield, a battle leaves the battlefield, a creature leaves the battlefield, an enchantment leaves the battlefield, a planeswalker leaves the battlefield.
Cares about: nothing.
a sorcery is cast — 3,720 cards in the game can cause this (River's Rebuke is one).
When River's Rebuke 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 Rebuke 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 Rebuke is one).
When a creature leaves the battlefield thanks to River's Rebuke:
25 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 Rebuke is one).
When River's Rebuke is cast:
5 other cards care about it too. These are the ones with the most connections.