Once in play, Cavern of Souls can be tapped for one mana of any color, but there's a catch
Two further Futuristic Rares Pikachu ex in day and night versions are confirmed as exclusives to the Ultra-Premium Collections releasing November 6
The SAR slot alone contributes 3,044 (34%) of total box value
With the hybrid mana change, the number of decks that can run this incredible protection piece will skyrocket
They can be used in good faith, or for ill, and the verdict on how problematic a card can be is more complex than whats written on it: it requires context of how and when its played, with what cards it is played, and in what scenario
Concealed Courtyard, Spirebluff Canal, Blooming Marsh, Inspiring Vantage and Botanical Sanctum reprint MTGs offering of enemy fast lands - land cards that can be tapped for either of two mana colours, but enter the battlefield tapped unless you control two or fewer other lands