Dust Corona

The "can't be blocked by flyers" clause is the color-pie tell here: this is white's evasion-denial logic ported into red as a timeshifted curiosity. Where blue and white historically handed creatures actual flight or made them unblockable outright, this aura does the opposite work from the same toolbox, stripping defenders of the one thing they have over a ground attacker. The +2/+0 is the headline, but the blocking restriction is what makes it specifically a closer: in a board state where the opponent is leaning on a flying wall to stall, a one-mana aura that both pumps and walks an attacker past those blockers can end a stalled race in a single swing. The cost of all that, of course, is the aura tax that has dogged every pump enchantment since the earliest sets: commit a card and a mana to a creature, and a single instant-speed removal spell two-for-ones you. That math is why auras of this shape live and die by how cheap they are and how fast the deck wants to be, and at one mana with a relevant evasion rider, this one sits at the aggressive end of that tradeoff rather than the value end.