The Mana Rig
From Dominaria United Commander set
The Mana Rig
Legendary Artifact
Whenever you cast a multicolored spell, create a tapped Powerstone token. (It's an artifact with "
: Add
. This mana can't be spent to cast a nonartifact spell.")
,
: 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.