"These glyphs are more than trail markings! They tell a story as they go. But does it end in celebration or tragedy?"

Deeproot Pilgrimage

Whenever one or more nontoken Merfolk you control become tapped, create a 1/1 blue Merfolk creature token with hexproof.

The Lost Caverns of Ixalan

The Lost Caverns of Ixalan Promos

If more than one nontoken Merfolk you control becomes tapped at the same time (for example, to pay the cost of Adaptive Gemguard's activated ability), Deeproot Pilgrimage's ability will trigger only once.