Oko, the Ringleader is a mythic Legendary Planeswalker — Oko card from Outlaws of Thunder Junction Promos (POTJ), collector number 223p. Current market price: $0.62 (foil $1.19), TCGplayer market prices via Scryfall.
At the beginning of combat on your turn, Oko becomes a copy of up to one target creature you control until end of turn, except he has hexproof. +1: Draw two cards. If you've committed a crime this turn, discard a card. Otherwise, discard two cards. −1: Create a 3/3 green Elk creature token. −5: For each other nonland permanent you control, create a token that's a copy of that permanent.