Moltensteel Surge

({p/b} can be paid with either {b} or {1} and 1 life.)
Choose one —
• Destroy target artifact if it has converted mana
cost 3 or less or if {r}{r}was spent to cast this spell.
• Destroy target creature if it has converted mana
cost 3 or less or if {b}{b}was spent to cast this spell.
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You can melt down anything if you try hard enough.