The Werewolf Scientist

{3}{r/g}, {t}: Target creature loses all creature types and becomes a 2/3 Werewolf with "At
the beginning of each precombat main
phase, if a player cast two or more spells last turn, this creature gains Scar. (This creature takes damage in the form of -1/-1 counters)" .
Werewolf's get +2/+0 and have Haste and Trample.