Caduceus Clay, Grave Maker

Protection from Black
{2}{t}: Summon Enchant Artifact and put it on
target Creature
Enchanted Creature has "This creature gains a
-1/-1 when attached to a creature.
At the beginning of the its owner's upkeep, roll a 20 sided die."
1-10: Nothing happens to Enchanted Creature
11-20: Put another -1/-1 counter on Enchanted Creature