Trinket Mage
Creature — Human Wizard
When this creature enters, you may search your library for an artifact card with mana value 1 or less, reveal that card, put it into your hand, then shuffle.
Scott Chou
The List (PLST)
• #DDU-41Rulings
If a card in a player's library has {X} in its mana cost, X is considered to be 0.
(wotc • 2021-03-19)
Rulings
If a card in a player's library has {X} in its mana cost, X is considered to be 0.
(wotc • 2021-03-19)