You may activate the loyalty abilities of Urza twice each turn rather than only once.
+2: Artifact, instant, and sorcery spells you cast this turn cost 
less to cast. You gain 2 life.
0: Create two 1/1 colorless Soldier artifact creature tokens.
−3: Exile target nonland permanent.
−10: Artifacts and planeswalkers you control gain indestructible until end of turn. Destroy all nonland permanents.