Tainted Harmony

You may have target opponent return a creature
card of their choice with mana value 2 or less from
the graveyard to the battlefield under their control
rather than pay this spell's mana cost. Creatures returned to the battlefield this way gain hexproof
until end of turn.

As you cast this spell, target creature an opponent controls gets -2/-2 until end of turn. If that creature
would die this turn, exile it instead.