Deeproot Pilgrimage is a rare Enchantment card from The Lost Caverns of Ixalan Promos (PLCI), collector number 52p. Current market price: $2.05 (foil $2.55), TCGplayer market prices via Scryfall.
Whenever one or more nontoken Merfolk you control become tapped, create a 1/1 blue Merfolk creature token with hexproof.