Urza, Mirrodin's Defender

+2: You gain X life, where X is the amount of mana used to cast Urza, Mirrodin's Defender, -5.
-X: Create X 1/1 Construct Artifact creature tokens, where X is the amount of loyalty used to use this ability.
-10: You gain an emblem that says "Planeswalkers you control start with 3 more loyalty counters."