Tremor

The flying exemption converts a symmetrical sweeper into an asymmetrical one: the same single point of damage that wipes the enemy's swarm leaves your own air force untouched, so the version that walks away is whichever board lives above the dirt theirs sits in. One damage is deliberately tiny, a number chosen to mow down one-toughness tokens and mana creatures while doing nothing to anything that survives a single point. That narrow band of effect is the design's defining feature: this is an answer to the cheapest, widest creatures before they accumulate, not a generic board reset. The same idea has been revisited at larger scales: Pyroclasm pushes the effect to two damage for two mana, and Earthquake scales the number with available mana while also reaching players. This sits at the floor of that family, the version with the smallest number and the strictest exemption, where the flying clause becomes the lever that decides who survives the rumble.