actually it lets you play green creatures as if they had flash
I have Yeva, Nature's Herald on the battlefield and Dryad Arbor in my hand.At what times can I play the Dryad Arbor?
115.2a Playing a land is a special action. To play a land, a player puts that land onto the battlefield from the zone it was in (usually that player's hand). A player can take this action any time he or she has priority and the stack is empty during a main phase of his or her turn, but only if he or she hasn't yet played a land that turn. See rule 305, "Lands."
305.9. If an object is both a land and another card type, it can be played only as a land. It can't be cast as a spell.
702.8. Flash702.8a Flash is a static ability that functions in any zone from which you could play the card it's on. "Flash" means "You may play this card any time you could cast an instant."701.11b To play a card means to play that card as a land or to cast that card as a spell, whichever is appropriate.
Yeah, it would need to say "You may play green Creature Cards as though they had Flash." to include the only Land Creature in existence.