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Phasing (This phases in or out before you untap during each of your untap steps. While it's phased out, it's treated as though it doesn't exist.)
When Ertai's Familiar phases out or leaves the battlefield, mill three cards.
: Until your next upkeep, Ertai's Familiar can't phase out.
Activating the activated ability will prevent Ertai’s Familiar from phasing out for any reason, not just due to its own phasing ability.