Krowats Mobdriver

{r}{t}: Target creature gains haste and +2/+0 until end of turn.
Relentless {r}{x}{x} (When you would normally tap Krowats Mobdrive to attack or pay for activated ability of Krowats Mobdrive, you may pay {r}{x}{x} instead)
{x} is number of times Grymwyr has used relentless this turn.