fireshoes
Member
Encroaching Mycosynth is currently turning sideboard cards into artifacts. It affects "nonland permanent cards you own that aren’t on the battlefield", but rule 400.11c says cards outside the game can't be affected by spells or abilities.
400.11c. Cards outside the game can't be affected by spells or abilities, except for characteristic-defining abilities printed on them (see rule 604.3) and spells and abilities that allow those cards to be brought into the game.
400.11c. Cards outside the game can't be affected by spells or abilities, except for characteristic-defining abilities printed on them (see rule 604.3) and spells and abilities that allow those cards to be brought into the game.
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