edhseer Commander synergy, explained
Instant
Mana cost: {2}{W}
Creatures you control get +1/+1 until end of turn. Untap them.
on-cast — gives +1/+1
on-cast — untaps a permanent
Causes: untap a creature.
Cares about: nothing.
a creature untaps — 519 cards in the game can cause this (Rallying Roar is one).
an instant is cast — 3,931 cards in the game can cause this (Rallying Roar is one).
When Rallying Roar 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 (Rallying Roar is one).
When Rallying Roar is cast:
5 other cards care about it too. These are the ones with the most connections.