mtg treasure chest card Foil (395) Extended Adventures in the Forgotten Realms AFR then hand MTGNexus - Treasure Chest Mimic

After my initial confusion subsided, I quickly looked up the value of Arlinn

The ward ability means an opponent will likely have to two-for-one themselves to deal with the creature, and granting all your opponents' creatures base toughness 1 is just screaming "synergy" in the right Commander build

Nuka-Cola Vending Machine has the ability to turn your Food into Treasures, flavorfully replicating the currency reflected by the bottle caps of Fallouts signature drink

you just need to have a big creature

Instead, Rowan's deck should protect it with cards like Lightning Greaves, then take full advantage of its tap ability