Hathor, Gruul Battlemage

Riot (This creature enters the battlefield with
your choice of a +1/+1 counter or haste)
{t}{2}{r}{g}: Deal X amount of damage to any
target where X is the number of +1/+1 counters
on Hathor, Gruul Battlemage.
{1}{r/g}{r/g}: Move a +1/+1 counter from target
creature you control to Hathor, Gruul Battlemage.
Do this only once per turn and only at any time
you could cast an instant or sorcery