Hashep Oasis — ruling 1

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.

Hashep Oasis — ruling 2

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.

Hashep Oasis : règles, fonctionnement et interactions (MTG)

Hashep Oasis is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

: Add . , Pay 1 life: Add . , , Sacrifice a Desert: Target creature gets +3/+3 until end of turn. Activate only as a sorcery.

How it works : Hashep Oasis

Original English text — Wizards of the Coast / Scryfall

#1July 14, 2017· Wizards of the Coast
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.
No other card is named in this ruling.
#2April 18, 2017· Wizards of the Coast
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.
No other card is named in this ruling.