Archway of Innovation is a rare Land card from Modern Horizons 3 (MH3), collector number 350. Current market price: $2.68 (foil $5.00), TCGplayer market prices via Scryfall.
This land enters tapped unless you control an Island. {T}: Add {U}. {U}, {T}: The next spell you cast this turn has improvise. (Your artifacts can help cast that spell. Each artifact you tap after you're done activating mana abilities pays for {1}.)