edhseer Commander synergy, explained
Instant
Mana cost: {1}{U}{U}
Return all noncreature, nonland permanents to their owners' hands.
on-cast — bounce
Causes: an artifact leaves the battlefield, a battle leaves the battlefield, an enchantment leaves the battlefield, a planeswalker leaves the battlefield.
Cares about: nothing.
an artifact leaves the battlefield — 1,680 cards in the game can cause this (Filter Out is one).
an instant is cast — 3,931 cards in the game can cause this (Filter Out is one).
When Filter Out is cast:
427 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 (Filter Out is one).
When Filter Out is cast:
5 other cards care about it too. These are the ones with the most connections.