The Mightstone and Weakstone (BRO)

Rare Colorless When The Mightstone and Weakstone enters the battlefield, choose one —• Draw two cards• Target creature gets -5/-5 until end of turn.T: Add CC. This mana can't be spent to cast nonartifact spells.(Melds with Urza, Lord Protector.)-------------Meld Partner: Urza, Lord ProtectorWhen Melded, it becomes the following:Uza, PlaneswalkerLegendary Planeswalker — UrzaYou may activate the loyalty abilities of Urza, Planeswalker twice each turn rather than only once.[+2]: Artifact, instant, and sorcery spells you cast this turn cost 2 less to cast. You gain 2 life.[+1]: Draw two cards, then discard a card.[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.