Shadow instructor

SoulBond "shadow", first strick
When linked, the opponent creature that blocked
or be blocked by "Shadow instructor" or her partenaire get -1/-1 until the end of the turn.
{t}{1}{b} : Create a black token 1/1 "shadow
disciple" with "SoulBond shadow" and "give
+1/+1 to it's linked partenaire"