Aloy, Savior of Meridian (SLD 2221)

Legendary Creature — Human Warrior • Mana cost: {3}{G}{U} • Secret Lair Drop • Mythic

Vigilance, reach
In You, All Things Are Possible — Whenever one or more artifact creatures you control attack, discover X, where X is the greatest power among them. (Exile cards from the top of your library until you exile a nonland card with that mana value or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)

Illustrated by Crystal Fae.