Wrenn and One is a rare Land Planeswalker — Wrenn card from Mystery Booster 2 (MB2), collector number 588. Current market price: $0.49, TCGplayer market prices via Scryfall.
+1: Wrenn and One gains "{T}: Add {G}" until your next turn. −1: Create a 1/1 green Squirrel creature token. −4: You get an emblem with "At the beginning of your precombat main phase, add {G} for each creature you control."