Ruga, Trial Stalker

+1: Target creature gets +2/+1 until end of turn. Until end of turn, if that creature becomes exerted, it gets an additional +1/+1.
-2: Put two -1/-1 counters on target creature. It gains defender until your next upkeep.
-7: Destroy all creatures with -1/-1 counters, then for each one, create a token that's a copy of it, except it's a white Zombie with no mana cost.