It can't be combined with other alternative costs, such as casting a spell "without paying its mana cost." To determine the total cost of a spell, start with the mana cost or alternative cost (such as a miracle cost) you're paying, add any cost increases, then apply any cost reductions
Cygames is no stranger to digital card games, but Shadowverse was their most blatant attempt to replicate Yu-Gi-Oh!'s success
It features a full cycle of on-color indestructible lands as well as bounce lands (allowing you to replay lands after remaining lands are destroyed), as well as a ton of mana rocks that will survive past your Armageddon effects
But - and obviously this is subjective - what I've seen of MB2 is just better than Unfinity
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The plans are reportedly for live-action content at this time