edhseer Commander synergy, explained
Instant
Mana cost: {2}{U}{U}
Counter up to four target spells and/or abilities.
on-cast —
Untap up to four target artifacts and/or creatures.
on-cast — untaps a permanent
Causes: counter a spell, untap an artifact, untap a creature.
Cares about: nothing.
a creature untaps — 519 cards in the game can cause this (Katara's Reversal is one).
an instant is cast — 3,931 cards in the game can cause this (Katara's Reversal is one).
When Katara's Reversal 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 (Katara's Reversal is one).
When Katara's Reversal is cast:
5 other cards care about it too. These are the ones with the most connections.