Treasure Map
Artifact
, 
: Scry 1. Put a landmark counter on this artifact. Then if there are three or more landmark counters on it, remove those counters, transform this artifact, and create three Treasure tokens. (They're artifacts with ", Sacrifice this token: Add one mana of any color.")
Illustrated by
The Lost Caverns of Ixalan#267RareEnglishLegality
Rulings
If Treasure Map leaves the battlefield before its ability resolves, you can't put a landmark counter on it. However, if it somehow already had three landmark counters on it before it left the battlefield, you'll get three Treasures.
If a third landmark counter is put on Treasure Map by something other than the resolution of its first ability (as modified by any applicable replacement effects), you won't remove those counters, transform Treasure Map, or get Treasures yet. You'll have to wait until you activate its first ability again.