Scorpion

Scorpion enters the battlefield with X charge
counters. Scorpion doesn't untap during your
untap step.
{3}: Untap Scorpion.
{2}{t}: Flip a coin. If you win the flip, destroy
target creature with flying. Otherwise, target
creature loses flying and Scorpion deals 4 damage
to that creature. Remove a charge counter from Scorpion.
Paid for by Cersei. Created by Qyburn. Fired by
Bronn. Destroyed by Daenarys.