Knightfisher

The trigger's fine print is doing quiet, deliberate work: it wants another nontoken Bird, not any creature and not the Fish tokens it spawns, which means the engine only pays out when you keep feeding it real cards. That single restriction (nontoken, another) turns a value payoff into a deckbuilding tax. You have to actually assemble a Bird board rather than loop the tokens back into themselves, and the Fish it makes are pointedly not Birds, so they cannot re-trigger the ability. What you get for that discipline is a token engine that widens two bodies at a time: every Bird that lands brings a chump-blocking, go-wide Fish along with it, and the 4/5 flying body means the card threatens on its own even when the trigger stays dormant. Blue has run plenty of "creature enters, make a token" payoffs, most of them colorless value cards happy to fire off anything on the board; this one commits hard to a tribe and rewards you for staying on-type. The design is less about raw rate than about texture: it asks whether your deck is Bird-dense enough to justify the Fish-less turns you might spend when no Bird arrives, and whether the payoff for keeping that density is worth building around at all.