edhseer Commander synergy, explained
Instant
Mana cost: {1}{U}
Counter target artifact or creature spell unless its controller pays {4}.
on-cast —
Causes: counter an artifact, counter a creature.
Cares about: nothing.
an instant is cast — 3,931 cards in the game can cause this (Spectral Interference is one).
When Spectral Interference 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 (Spectral Interference is one).
When Spectral Interference is cast:
5 other cards care about it too. These are the ones with the most connections.