edhseer Commander synergy, explained
Instant
Mana cost: {1}{U}
Counter target spell unless its controller pays {X}, where X is the greatest power among creatures you control.
on-cast —
Causes: counter a spell.
Cares about: nothing.
an instant is cast — 3,931 cards in the game can cause this (Spell Rupture is one).
When Spell Rupture 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 (Spell Rupture is one).
When Spell Rupture is cast:
5 other cards care about it too. These are the ones with the most connections.