Shellder

Other creatures you control with toughness
greater than their power deal damage equal to
their toughness.
If an effect or ability would cause an artifact you control to gain a counter instead, it gains twice
that many counters placed on it.
Evolve {2}{u}{u}{b}{b}{t} Sacrifice Shellder. Search
your hand and library for a card named "Cloyster"
and place it on the battlefield tapped.