Faerie Swarm

A flier whose body is denominated in your blue permanent count, not in raw mana, which is a quietly unusual ask for a color that rarely hands you wide boards or big bodies. The catch is what counts: your blue spells deployed to the battlefield (the dorks, the other faeries, the enchantments) feed the number, but lands do not, basic Islands included, because lands have no mana cost and so are colorless. That pushes the design toward a deck heavy in blue nonland permanents rather than a manabase, and it punishes any instinct to splash a second color for answers, since off-color cards add nothing to the count. The Faerie type fits the math more than it fits the beatdown plan: this is a tribe built around evasive disruption, and a swarm that scales with how many of its kin have already landed is at least thematically honest. Flying is what makes the variable size pay off; a ground creature this conditional would stall against blockers, but an evasive body that grows alongside your board becomes a clock with no easy answer. The tension in the design is that it is smallest exactly when you most need a body, early with little on the battlefield, and largest only once you are already ahead. It is less a stabilizer than a payoff for a mono-blue commitment that has already gone well.