Urza, lord protector bug
Urza lord protector is somehow able to be activated either with 6 lands or with the weak stone and powerstone. Neither card's text justifies why this is possible. The mana from weak and powerstone should not affect artificers and activated abilities are not spells. This provides an unfair advantage allowing a very powerful planeswalker mend at least 1 turn earlier than should be otherwise possible.
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Dajoway#05670
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[Deleted User] commented
The Mightstone and Weakstone mana cannot be used to cast a nonartifact spell. It absolutely can be used for abilities