Tricky Mage is a uncommon Creature — Human Wizard card from Unknown Event (UNK), collector number UU03. Current market price: $25.00, TCGplayer market prices via Scryfall.
When Tricky Mage enters the battlefield, if you're on the Mirran team, search your library for an artifact card with mana value 2 or less, reveal it, put it into your hand, then shuffle. If you're on the Phyrexian team, search your library for an artifact card with mana value 6 or greater, reveal it, and put it into your hand, then shuffle.