Fecund Greenshell is a rare Creature — Elemental Turtle card from Bloomburrow (BLB), collector number 362. Current market price: $1.25 (foil $2.49), TCGplayer market prices via Scryfall.
Reach As long as you control ten or more lands, creatures you control get +2/+2. Whenever this creature or another creature you control with toughness greater than its power enters, look at the top card of your library. If it's a land card, you may put it onto the battlefield tapped. Otherwise, put it into your hand.