Wig Wog

+2: create a 1 loyalty point copy of Wig Wog The devourer that you can sacrifice for 1 mana
-1: until end of turn, two other slimes on the battlefield become a copy of target creature with a +1/+1 counter on it
-7: Sacrifice all slimes on the battlefield. Create a 5/5 Wig Wog the Devourer token with X +1/+1 counters on it where x is the amount of slimes