Ghost Block

When you play Ghost Block, put it face-down on
the battlefield under the control of an opponent.
Tell them it is a ? block with a helpful gift, but
that it will disappear at the end of their next turn.
If they tap it or attempt to turn it face-up, turn it
face-up. Ghost Block does 1 damage to them and
that opponent gets a troll counter, then put
Ghost Block under your control and sacrifice it.
If the opponent does not tap or attempt to turn
Ghost Block face-up at the end of their next tu