Whenever you cast a noncreature spell, create a 1/1 blue Bird creature token with flying and vigilance.
Whenever you attack with one or more Birds, scry 2.
Cast a high density of cheap noncreature spells to flood the board with flying, vigilant Birds, then turn them sideways for chip damage backed by repeated scry-2 card filtering. You play a tempo/spellslinger game in the early turns, protect your board, and eventually win with a wide evasive air force or an overrun-style finisher.
Each cantrip, removal spell, or counterspell also builds your board, so you rarely run out of gas
Birds have flying and vigilance, letting you attack and still hold up interaction
Scry 2 on every Bird attack smooths draws and digs toward answers and finishers
Mono-blue gives access to the deepest pool of card advantage, counters, and tempo tools
Mono-blue lacks efficient board wipe recovery and removal for resolved permanents
Token swarm is fragile to a single sweeper, which can erase hours of value
Individual Birds are tiny, so the clock is slow without an anthem or overrun effect
Heavily reliant on the commander being on the battlefield to generate value