Iguana Parrot

Three keywords stacked on a 2/2 for three mana is a lot of text for a common-tier body, and the interesting part is how they cover for each other's weaknesses. Flying and vigilance make it a clock that never has to stop pressing, attacking and still holding back a blocker, which matters more on a small evasive body than on a fat one that would win any race anyway. Prowess does the compounding work: a 2/2 that grows every time you cast a noncreature spell rewards a deck built on cheap interaction and cantrips, so the flier that looks like it dies to a stiff breeze can be swinging for four or five in a hand full of spells. The design tension is between the ceiling and the floor. Left alone with an empty hand it does exactly what a 2/2 flier does; loaded into a shell that spends the turn casting instants and sorceries, the growth stacks while vigilance keeps it alive on the crackback. The name and the trio of creature types point at a crossover treatment rather than a straight-faced set staple, but the ability package is a coherent piece of tempo design: an evasive prowess threat that wants to be the beneficiary of a busy noncreature turn.