Being able to reduce any creature type of your choices mana cost by is a pretty sweet payoff, especially if youre playing multiple five-color cards, such as in a Sliver build or a Dragon build employing EDHRECs #1 Commander overall: The Ur-Dragon or some of the most valuable cards from the Dragon-focused Scourge set
If a face-down spell leaves the stack and goes to any zone other than the battlefield (if it was countered, for example), you must reveal it
The hits are weirder
As for the Premium subscription, since full app functionality is still available for free players, and $9.99/month is a bit steep, after my 2-week trial ends I think Ill be perfectly happy with the free areas of the app, unless one month there are some amazing Premium cosmetic items that I cant live without
A simple opt-out of Alchemy option in player settings would go a long way
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