Windreaver

Almost everything this body does happens at mana sinks, and that is the entire point of the design. The guild that produced this era of cards was preoccupied with making creatures that never quite died: the bounce ability is the survival valve, letting it dodge a board wipe, a targeted removal spell, or an unfavorable block by retreating to hand at instant speed, at the cost of recasting it later. The power/toughness swap is the other half of the trick, turning a defensive 1/3 wall into a 3/1 threat whenever a window opens, and the toughness pump and vigilance grants let it hold a line and attack in the same turn. None of it is free, and that is what keeps the card honest: every activation taxes the mana you would rather be spending on threats and answers, so it functions as a flood insurance policy more than a proactive plan. A flyer that drinks excess mana, refuses to stay dead, and reconfigures its combat profile on demand is a control deck's idea of a finisher: not fast, but nearly impossible to interact with on the opponent's terms. The design lineage runs through later "mana-sink elemental" creatures that try to be both a body and a long-game engine, but few packed this many modes onto a single defensive frame.