Grove of the Guardian is a rare Land card from Return to Ravnica (RTR), collector number 240. Current market price: $0.29 (foil $0.27), TCGplayer market prices via Scryfall.
{T}: Add {C}. {3}{G}{W}, {T}, Tap two untapped creatures you control, Sacrifice this land: Create an 8/8 green and white Elemental creature token with vigilance.