Mario Kart Queen

Mario Kart Queen comes into play with 3 Shell Counters
Whenever an opponent casts a spell add 1 Shell Counter to Mario Kart Queen
{u},{t}: Remove a Shell Counter, tap target creature.
{w},{t}: Remove a Shell Counter, prevent all damage that would be dealt this turn.
{r},{t}: Remove a Shell Counter, MK Queen deals 3 damage to target creature or player