Plane-Merge Elf is a rare Creature — Elf Warrior card from Mystery Booster Playtest Cards 2021 (CMB2), collector number 83. Current market price: $0.31, TCGplayer market prices via Scryfall.
Landship — At the beginning of your upkeep, you may look at the top card of your library. If it's a land, you may reveal it. If you do, create a 1/1 green Elf Warrior creature token. Kinfall — Whenever a creature enters the battlefield under your control, if it shares a creature type with Plane-Merge Elf, creatures you control get +1/+1 until end of turn.