Guiman, the Cure Chaser

+1: Flip a coin, if it's head; target creature you control gets +3/+3 until end of turn otherwise it gets -2/-2 until end of turn.
-2: Create a horror figure token 2/2
-10: Sacrifice X creatures you control; create a horror figure token 4/4 with "Trample, reach." with X +1/+1 counters on it.