Wrenn and Six is a mythic Legendary Planeswalker — Wrenn card from Modern Horizons (MH1), collector number 217. Current market price: $7.88 (foil $20.55), TCGplayer market prices via Scryfall.
+1: Return up to one target land card from your graveyard to your hand. −1: Wrenn and Six deals 1 damage to any target. −7: You get an emblem with "Instant and sorcery cards in your graveyard have retrace." (You may cast instant and sorcery cards from your graveyard by discarding a land card in addition to paying their other costs.)