edhseer Commander synergy, explained
Instant
Mana cost: {U}{U}
Copy target instant or sorcery spell, then return it to its owner's hand. You may choose new targets for the copy.
on-cast — copies a spell
on-cast — bounce
Causes: copy an instant, copy a sorcery, an instant leaves the battlefield, a sorcery leaves the battlefield.
Cares about: nothing.
a sorcery is copied — 83 cards in the game can cause this (Narset's Reversal is one).
When Narset's Reversal is copied:
21 other cards care about it too. These are the ones with the most connections.
an instant is copied — 87 cards in the game can cause this (Narset's Reversal is one).
31 other cards care about it too. These are the ones with the most connections.
an instant is cast — 3,931 cards in the game can cause this (Narset's Reversal is one).
When Narset'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 (Narset's Reversal is one).
When Narset's Reversal is cast:
5 other cards care about it too. These are the ones with the most connections.