Rallentando, the Dread Bringer

Flying, Consume (Whenever this creature kills another creature, this creature gains +1/+1 counters equal to that creature's toughness)
If this spell was countered, create a 2/2 flying green pterodactyl token
{2}: This creature gets +2,+1 until end of turn.
{2}{g}{g}{g}: Gain health equal to this creature's toughness. Create a 1/1 flying green baby pterodactyl token