Ayaro, Fortune Vendor

Whenever you draw one or more cards, you
may reveal any number of artifacts from
among them. If you do, choose one; Artifact
spells cast can't be countered this turn, or
artifact spells cost {1} less to cast until end of
turn.
{5}: You and target opponent choose an
artifact you each control, then exchange
control of those two permanents. Untap
them. Draw a card.