Prize Wall is a common Creature — Wall card from Unfinity (UNF), collector number 57. Current market price: $0.16 (foil $0.31), TCGplayer market prices via Scryfall.
Defender {U}, {T}: You get {TK}. {4}{U}, {T}: You may put a sticker on a nonland permanent you own. Activate only as a sorcery.