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.
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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.)