Throt the Unclean

{b/g}{b/g}{b/g}: target Rat you control gains a mutation
counter, then roll a d6. Then apply the effect
shown below to that creature.
1: Target creature gains -3/-3.
2: Target creature gains -1/-2 and skulk.
3: Target creature gains +0/+2 and defender.
4: Target creature is goaded and has +2/+0.
5: Target creature gains menace and +3/+1.
6: Target creature gains indestructible and +5/+5.
If a creature has 3 or more mutation counters,
sacrifice it at e