Gluttonous Slime

Devour normally lives on the front of an aggressive curve: cash in a board of tokens during your main phase, get a fat thing, swing the following turn. Pairing the mechanic with flash quietly rewrites that timing. Devour 1 is the sacrifice clause itself, a static ability that applies as the Ooze enters: you choose how many creatures to feed it, and it arrives scaled one-for-one with +1/+1 counters. The 2/2 printed body is almost incidental; the real size is whatever the board lets you offer up. That gives a player two distinct windows. Flash it in before blocks are declared, sacrificing chaff as it enters, and it lands as an oversized surprise blocker, ambushing an attacker that expected to get through. Or hold it for the end of your opponent's turn, convert a board that has stopped contributing into one resilient threat, and untap with a single body that dodged the sweepers a wide board invites. The tension a designer faces with Devour, that it telegraphs the payoff a full turn ahead while the fodder you intend to sacrifice sits exposed to removal and combat, is exactly what flash answers here: the replacement effect applies the sacrifice and the counters in the same instant, on your terms, with your opponent's attack or pass already committed. It turns a sorcery-speed pump-and-pray into an instant-speed reading of the table.