Green from @BasedUtena

Flash, Flying
When Green from @BasedUtena enters the battlefield, counter target spell unless an
opponent pays {2}. If that spell is countered this
way, exile it instead of putting it into its owner's graveyard. You may look at and cast that card for
as long as it remains exiled, and you may spend
mana as though it were mana of any type
to cast that spell.