Marquise de Cat

At the beginning of your upkeep, for each Wall you control, choose one — • Create a 1/1 white Cat creature token. • Put a lumber counter on that Wall. • Discard a card. Put two lumber counters on that Wall. Build — Tap an untapped Wall you control: Remove all lumber counters from that Wall. Add {C} for each counter removed this way. Spend this mana only to cast Wall, Cat, or artifact spells.{/color#ffffff}