Market in the Sundom

Sell Stock - {t}: Create a Metal Shard token.

Modification - {t}: Sacrifice two Metal Shard tokens, choose a target artifact equipment, place a +1/+1
counter on it. (The equipment now gives an
additional +1/+1 to the equipped creature.)

Buy - {t}: Sacrifice three Metal Shard tokens, search
your library for an equipment that costs {3} or less
and play it onto the battlefield. Shuffle your library.