edhseer Commander synergy, explained
Instant
Mana cost: {1}{U}
Return target permanent to its owner's hand if that permanent shares a color with the most common color among all permanents or a color tied for most common.
on-cast — bounce
Causes: a permanent leaves the battlefield.
Cares about: nothing.
a permanent leaves the battlefield — 315 cards in the game can cause this (Barrin's Unmaking is one).
1 other card cares about it too. These are the ones with the most connections.
an instant is cast — 3,931 cards in the game can cause this (Barrin's Unmaking is one).
When Barrin's Unmaking 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 (Barrin's Unmaking is one).
When Barrin's Unmaking is cast:
5 other cards care about it too. These are the ones with the most connections.