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The engine that spell-based aggro had been circling for years: a flier that turns your ritual of cheap spells into a clock. The +2/+0 stacks with every noncreature cast, so a hand of one-mana burn and cantrips resolves into an evasive threat that can go from a 1/2 to lethal in a single turn. What separates it from earlier prowess-style bodies is the plot line. Prowess creatures have always had a sequencing problem: they want to be on the battlefield before you cast your spells, but casting them costs tempo you would rather spend on the spells themselves. Plot dissolves that tension by letting you pay for the Bird a turn early and drop it for free the turn you go off, so your whole mana pool on the kill turn feeds the growth rather than the deployment. Haste closes the loop; the plotted copy connects the moment it lands. The 1/2 body is the tax on all of this: it folds to almost any removal, and without gas in hand it is a one-power flier chipping in the air rather than the burst threat it wants to be. This is a payoff that demands you already be committed to the plan, not a card that invites you into it. Coupling a growth trigger to a delayed, free deployment is the whole idea, and it makes the card play far faster than a two-drop 1/2 has any right to.