Tribute Mage
Creature — Human Wizard
When this creature enters, you may search your library for an artifact card with mana value 2, reveal that card, put it into your hand, then shuffle.
Scott Murphy
Magic Online Promos (PRM)
• #91249Rulings
If a card in your library has X in its mana cost, X is considered to be 0.
(wotc • 2019-06-14)
Rulings
If a card in your library has X in its mana cost, X is considered to be 0.
(wotc • 2019-06-14)