Thor Odinson

Doubling a keyword rather than tuning a number is the whole conceit, and it changes how the body scales. Prowess printed twice means a single noncreature spell pushes this 4/4 up two full steps, so a lone cantrip or burn spell makes it a 6/6, and a pair of them makes it an 8/8. The two triggers fire independently, so a three-spell turn stacks six separate +1/+1 bonuses for a 10/10 flier that still guards the ground. That combination is the design logic worth noticing: flying decides whether the pumps connect, vigilance decides whether committing to the swing leaves you exposed, and the doubled prowess decides how much each pump is worth. Most prowess creatures force a choice between a threatening attack and a defensive posture; this one refuses the trade, sizing up on offense while holding back on defense in the same turn. The catch is that none of it sticks. The bonuses are end-of-turn effects rather than counters, so the threat collapses to a bare 4/4 at every upkeep and has to be re-fueled from a spell-dense hand. It rewards a deck that keeps the spells coming and punishes the turn the well runs dry.