"Halt, traveler. Whatever you seek, you will not find it here."

The Lost Caverns of Ixalan Promos

Sentinel of the Nameless City

Vigilance
Whenever this creature enters or attacks, create a Map token. (It's an artifact with "{1}, {T}, Sacrifice this token: Target creature you control explores. Activate only as a sorcery.")

The Lost Caverns of Ixalan

Vigilance
Whenever Sentinel of the Nameless City enters the battlefield or attacks, create a Map token. (It's an artifact with "{1}, {T}, Sacrifice this artifact: Target creature you control explores. Activate only as a sorcery.")

Vigilance
Whenever Sentinel of the Nameless City enters the battlefield or attacks, create a Map token.