Terra, Fallen to Darkness

Terra, Fallen to Darkness enters with X +1/+1 Counters where X is the mana spent to cast it.
You may remove a number of +1/+1 counters equal to or greater than target nonland permanent's mana cost. If you do destroy it.
You must remove at least one counter to use this ability.
If Terra, Fallen to Darkness is sent to the graveyard you may exile a nonland creature you control to return it to your hand.