Crock's Guidance

{2}{t}, roll a 20 sided die:
1-5, Target creature get a -2/-2 counter till end
of turn. 6-10, target creature get a +2/+2 counter
till end of turn. 11-20, next time Crock's Guidance attacks it gets a -1/-1 counter till end of turn.
Your only as good as the one's you defeat