edhseer Commander synergy, explained
Instant // Sorcery
Mana cost: {2}{U} // {2}{R}
Counter target spell unless its controller pays {3}.
on-cast —
Aftermath
Up to three target lands don't untap during their controller's next untap step.
on-cast — keeps permanents from untapping
Causes: counter a spell.
Cares about: nothing.
a sorcery it makes cheaper to cast — 3,585 cards in the game can cause this.
3,577 other cards cause it too. These are the ones with the most connections.
a sorcery is cast — 3,720 cards in the game can cause this (Reduce is one).
When Reduce // Rubble is cast:
424 other cards care about it too. These are the ones with the most connections.