Urza's Ruinous Blast
Legendary Sorcery (CMC 5)
(You may cast a legendary sorcery only if you control a legendary creature or planeswalker.)
Exile all nonland permanents that aren't legendary.
Decks with Urza's Ruinous Blast
[CMM] Commander Masters #842 (R)
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[BRC] The Brothers' War Commander #79 (R)
[DMC] Dominaria United Commander #107 (R)
[DOM] Dominaria #39 (R)
[PDOM] Dominaria Promos #39s (R)
[PCTB] From Cute to Brute #7 (R)