Indomitable Will

What flash buys an aura is the ambush: the +1/+2 lands during combat or in response to removal, which turns a buff that would otherwise telegraph itself across an empty turn into a genuine trick. The toughness skew is the tell here. Most pump auras lean offensive, but +1/+2 is built to win combat math the defender's way: a blocker that survives the swing and trades up, or a creature that ducks under a point of direct damage pointed its way. The downside of any aura is the two-for-one if the creature dies, and the value of flash is precisely that it lets you withhold the card until the threat is real, so you are rarely committing the enchantment to a creature that gets answered in response. Cheap permanent pumps have circled this same escape from the card-disadvantage trap ever since: pay a little more in tempo or color for the right to keep the bluff alive until the last possible moment.