Shapeshifter of the Waves

Changeling (This card is every creature type.)
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 Shapeshifter of the Waves phases in, draw
a card, then discard a card.
"It's a fish! Actually, no, it's a shark. Wait,
actually..."