The Mightstone and Weakstone - The Brothers' War (BRO)

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.)
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Meld Partner: Urza, Lord Protector
When Melded, it becomes the following:
Uza, Planeswalker
Legendary Planeswalker — Urza
You 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.