Fairie Dragon

Fairie Dragon
UnitDragonCost: 4ATK: 4 HP: 2
Arrives: You may put a feather rune on a tech I or II unit.
Units with feather runes are 3/1 and have flying.
GreenBalance Tech II

Card-Specific Rulings
If Fairie Dragon leaves play, units with feather runes no longer have flying and are no longer 3/1. If a Fairie Dragon later enters play, any units with a feather rune (even from a previous Fairie Dragon) will be flying and will be 3/1. — Sirlin
If something such as Manufactured Truth copies a unit with a feather rune, the copy will not have the rune, will not be 3/1 and will not have flying. — Sirlin
Fairie Dragon only changes the "base" ATK and health of those units; runes and other effects can add or subtract ATK or health. — Sirlin
Units with feather runes gain flying, but don't lose any of their other abilities. — Sirlin
Flying Rulings
As a conceptual shorthand, think about flying and anti-air as follows: Ground forces without anti-air can only shoot straight. They can never hit fliers, ever. Flying forces can shoot both straight and down. Anti-air forces can shoot both straight and up. This is never a handicap because even though they CAN hit patrolling fliers, they aren't forced to. As a patroller, you only stop an attacker if it's on the *same* level as you. Anti-air ground forces on patrol will shoot at fliers as they fly over. — Sirlin
Fliers can ignore patrollers that don't have flying. In other words, they can attack something else instead if you want. — Sirlin
Fliers cannot ignore flying patrollers. The usual rules of the patrol zone apply, meaning if you want to attack with a flier at all, that flier CAN attack patrolling fliers so it must do that rather than attack other things such as non-patrollers or tech buildings. — Sirlin
When a flier attacks another flier or gets attacked by another flier, they both deal combat damage to each other as usual. When a flier attacks a ground unit or hero without anti-air, the flier deals its combat damage to the ground thing and the ground thing does NOT deal any combat damage to the flier. Ground forces without anti-air cannot even attack a flier at all. Ground forces with anti-air can attack fliers and deal combat damage to them as usual when they do. — Sirlin