The Mightstone and Weakstone // Urza, Planeswalker

When The Mightstone and Weakstone enters, choose one —
• Draw two cards.
• Target creature gets -5/-5 until end of turn.
: Add . This mana can't be spent to cast nonartifact spells.
(Melds with Urza, Lord Protector.) -

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

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