Deeproot Pilgrimage is a rare Enchantment card from The Lost Caverns of Ixalan (LCI), collector number 52. Current market price: $1.82 (foil $7.05), 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.