
Nonland permanents you control are artifacts in addition to their other types. The same is true for permanent spells you control and nonland permanent cards you own that aren't on the battlefield.
Encroaching Mycosynth has 4 printings, first in Phyrexia: All Will Be One (2023). EDHREC ranks it #4,018 among Commander cards. It appears most in Emry, Lurker of the Loch decks (1,796 on EDHREC). It has 2 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.