Common Sense

Win with a deck of only Common cards. Your Basic starting cards (Strike/Defend) are fine - it's Uncommon and Rare cards you can't have in the deck when you win, so decline every Uncommon/Rare reward (and any Colourless Uncommon/Rare from shops and events) and only ever pick Commons. Remove starting bloat as normal. Relics can be any rarity, so lean hard on strong relics. Comfortable on a lower Ascension with a solid Common backbone - Silent Poison commons or an Ironclad Strength core both hold up.