Griselda, Harmonic Discord

Magecraft - Whenever you cast or copy an instant
or sorcery spell, you may counter that spell or
copy. If you do, Griselda, Harmonic Dissonance
gets +1/+1 until end of turn and you create a
treasure token.
{u/r}{u/r}{u/r}, Sacrifice a treasure token: Copy target
instant or sorcery an opponent controls. You may
choose new targets for the copy.