Skrelv, Defector Mite is a rare Legendary Artifact Creature — Phyrexian Mite card from Phyrexia: All Will Be One Promos (PONE), collector number 33s. Current market price: — (foil $5.26), TCGplayer market prices via Scryfall.
Toxic 1 (Players dealt combat damage by this creature also get a poison counter.) Skrelv can't block. {W/P}, {T}: Choose a color. Another target creature you control gains toxic 1 and hexproof from that color until end of turn. It can't be blocked by creatures of that color this turn. ({W/P} can be paid with either {W} or 2 life.)