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