Hostile Desert
Land — Desert
: Add 
.
, Exile a land card from your graveyard: This land becomes a 3/4 Elemental creature until end of turn. It's still a land.
Amonkhet's desiccated land thirsts for blood.
Josh Hass
Hour of Devastation (HOU)
• #178Rulings
If Hostile Desert becomes a creature the same turn it enters the battlefield, you can't attack with it or tap it for mana.
(wotc • 2017-07-14)
Desert is a land subtype with no special meaning. It doesn't grant the land an intrinsic mana ability. Other cards may care about which lands are Deserts.
(wotc • 2017-04-18)
Rulings
If Hostile Desert becomes a creature the same turn it enters the battlefield, you can't attack with it or tap it for mana.
(wotc • 2017-07-14)
Desert is a land subtype with no special meaning. It doesn't grant the land an intrinsic mana ability. Other cards may care about which lands are Deserts.
(wotc • 2017-04-18)