edhseer Commander synergy, explained
Instant
Mana cost: {4}{B}
Target creature gets +1/+0, becomes black, and gains shadow until end of turn.
on-cast — gives +1/+0
on-cast — turns something into a creature
on-cast — grants a keyword
Flashback {1}{B}
Causes: nothing.
Cares about: nothing.
an instant is cast — 3,931 cards in the game can cause this (Traitor's Clutch is one).
When Traitor's Clutch 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 (Traitor's Clutch is one).
When Traitor's Clutch is cast:
5 other cards care about it too. These are the ones with the most connections.