Urza, Lord Protector

Artifact, instant, and sorcery spells you cast cost
{1} less to cast.
{7}: If you both own and control Urza, Lord
Protector and an artifact named The Mightstone
and Weakstone, exile them, then meld them into
Urza, Planeswalker. Activate only as a sorcery.
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"It's not out of the question that you might have a
very minor case of serious brain damage."