Liberator, Urza's Battlethopter - Promo Pack

Color: Artifact
Card Text: Flash
Flying
You may cast colorless spells and artifact spells as though they had flash. Whenever you cast a spell, if the amount of mana spent to cast that spell is greater than Liberator, Urza's Battlethopter's power, put a +1/+1 counter on Liberator.
Rarity: P
Cost: 3
Pow/Tgh: 1/2
Card Type: Legendary Artifact Creature - Thopter
Name: The Stone Brain
Finish: Regular
Card Number: 237/287
Set Name: Promo Pack: The Brothers' War