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If Dryad Arbor is changed into another basic land type (such as by Sea's Claim), it continues to be a creature and a Dryad.
Although originally printed with a characteristic-defining ability that defined its color, this card now has a color indicator. This color indicator can't be affected by text-changing effects (such as the one created by Crystal Spray), although color-changing effects can still overwrite it.
If Dryad Arbor is changed into another basic land type, it continues to be a green Dryad creature.
Due to its color indicator (appearing to the left of its type line), Dryad Arbor is green. Color indicators apply in all zones, not just the battlefield.
Dryad Arbor is played as a land. It doesn't use the stack, it's not a spell, it can't be responded to, it has no mana cost, and it counts as your land play for the turn.
Forest is a land type and Dryad is a creature type.
If a Dryad Arbor gains flash, or you have the ability to play Dryad Arbor as though it had flash (due to Teferi, Mage of Zhalfir or Scout's Warning, for example), you can ignore the normal timing rules for when during your turn you can play a land, but not any other restrictions. You can't play Dryad Arbor during another player's turn, and you can't play Dryad Arbor if you don't have any land plays remaining.
