Earthbind

Enchant creature
When Earthbind enters, if enchanted creature has flying, Earthbind deals 2 damage to that creature and Earthbind gains "Enchanted creature loses flying."

Summer Magic / Edgar

Foreign Black Border

Revised Edition

If cast on a flying creature, Earthbind removes flying ability and does 2 damage to target creature; this damage occurs only once, at the time Earthbind is cast. If another spell or effect later gives target creature flying ability, Earthbind does not affect this. Earthbind has no effect on non-flying creatures.

Collectors' Edition

Intl. Collectors' Edition

If the enchanted creature gains flying after Earthbind is put onto it, it will have flying. The two effects are simply applied in timestamp order.