Marauding Knight

{r/g}: Put a rage counter on target creature.
Pillage 3- (When this creature is attacking, you may sacrifice up to three
Rage Counters. This creature can either get
+X/+X until end of turn, where X is the number of
rage counters
on this creature that were sacrificed. Or, if you sacrificed
three, this creature gains trample until end of turn.)