The Mana Rig - Dominaria United Commander - 80

Legendary Artifact

Mana Cost: {3}

Whenever you cast a multicolored spell, create a tapped Powerstone token. (It's an artifact with "{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.")
{X}{X}{X}, {T}: Look at the top X cards of your library. Put up to two of them into your hand and the rest on the bottom of your library in a random order.

Mythic · Dominaria United Commander · #80 (DMC)

Illustrated by Zoltan Boros