Y'ryst, Knowledge Consumer

Unstable (At the beginning of your upkeep, you may choose to have this creature gets +1/-1 until end of
turn, or -1/+1 until end of turn.)
Counter target spell you control: Y'ryst,
Knowledge Consumer deals X damage to any
target where X is that spells converted mana cost.
{4}{u}{u}{u}: Return target instant or sorcery from
your graveyard to your hand.