Wretched Gryff

Emerge was the mechanic built to make creatures fold into other creatures, and this is the version pointed squarely at blue's appetite for card flow. The seven-mana sticker price is a number you are never meant to pay: the emerge cost of comes down by whatever you sacrifice, so an unwanted token or a creature that has already done its job converts into a 3/4 flier and a fresh card off the cast trigger. That cast trigger is the load-bearing piece. Because it fires on cast rather than on entry, the card replaces itself even if the Gryff is countered on the stack, so the exchange stays tempo-positive rather than riding on the body surviving. The design tension emerge resolves is the one every sacrifice-for-value engine faces: it lets you cash a creature whose usefulness has expired without the sequence reading as pure loss, since you trade up the curve and draw to refill in a single action. The body itself is incidental, a serviceable evasive blocker or clock; the reason to reach for this is the flexibility of the emerge math and the guaranteed card. It is the workhorse of its mechanic rather than its showpiece, the common-rarity proof that emerge could be a clean engine and not just a splashy mana discount.