A-Security Rhox 
Creature — Rhino Warrior
You may pay rather than pay this spell's mana cost. Spend only mana produced by Treasures to cast it this way.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyNOT LEGALvintageNOT LEGALcommanderNOT LEGAL