Guiman, Fallen Scientist

: Creatures you control have "Sacrifice this creature: Put a loyal counter on Guiman."
-1: Flip a coin. If it's head, target creature gains +6/+6 until the end of turn. Otherwise sacrifice a creature you control.
-X: Create a green horror token 0/0 with X +1/+1 counters on it and has "Trample, reach".