Lady Liz, Master Merchant

Trade Secrets - Whenever Liz, Master Merchant deals combat damage to a player, you may exchange control of an artifact you control with an artifact that player controls.

Savvy Negotiator - {t}, Sacrifice an artifact: Draw a card. Activate this ability only if you control at least two other artifacts.

Barter's Insight - {1}{p/w}{b}, {t}: Look at the top three cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order.