Omanyte

Unleash
If Omanyte has a +1/+1 counter, switch it's
power and toughness.
Rock Polish - {r}{u/b}{t} Remove a +1/+1 counter
from Omanyte, it gains 0/+2 until end of turn.
Evolve {1}{r}{r}{b}{b}{t} Sacrifice Omanyte. Search
your hand and library for a card named "Omastar"
and place it on the battlefield tapped.