Actually, cancel that:
A Purple Nymph with Deja Vu...that spawned a Purple Nymph with Deja Vu...that spawned a Purple Nymph with Hatch. Too bad I didn't get to see what the third one would become because I won the battle right after that...
EDIT:
Erm, why are you battling level 1s for curiousity's sake?
For fun. I made this deck for the sole purpose of mutating things to see what I could get, not to win. This wouldn't be playable against a level 3, or consistent at the very least.