Mazemind Tome [BRR - 30] Commander Phyrexia All Will Be One Then that creature deals damage

Then that creature deals damage equal to its power to target creature you don't control

I'll test it myself

Rules Text Contains: Ascend (If you control ten or more permanents

Rules Text Contains: T: Choose a color of a permanent you control

Other legendary creatures you control have exploit

Mazemind Tome [BRR - 30] Commander Phyrexia All Will Be One Then that creature deals damageRarity: R #: 30 Creature Type or Sub Type: Artifact Rules Text Contains: T, Put a page counter on Mazemind Tome: Scry 1. 2, T, Put a page counter on Mazemind Tome: Draw a card. When there are four or more page counters on Mazemind Tome, exile it. If you do, you gain 4 life.