Ramunap Ruins
Land — Desert
: Add 
.
, Pay 1 life: Add 
.
, Sacrifice a Desert: This land deals 2 damage to each opponent.
Florian de Gesincourt
Rulings
If a Desert has an ability with a cost of "Sacrifice a Desert," you can sacrifice that Desert to pay the cost for its own ability.
(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 a Desert has an ability with a cost of "Sacrifice a Desert," you can sacrifice that Desert to pay the cost for its own ability.
(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)