Waker of the Wilds is a rare Creature — Merfolk Shaman card from Ixalan (XLN), collector number 215. Current market price: $0.28 (foil $0.35), TCGplayer market prices via Scryfall.
{X}{G}{G}: Put X +1/+1 counters on target land you control. That land becomes a 0/0 Elemental creature with haste. It's still a land.