Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.
Creatures with power less than Elusive Otter's power can't block it.
Grove's Bounty 
Sorcery - Adventure
Distribute X +1/+1 counters among any number of target creatures you control. (Then exile this card. You may cast the creature later from exile.)