Mutable creatures have a normal mana cost and a mutate cost - you can either pay the mana cost, as you would a normal card, or the mutate cost
These theoretically draw more creatures, which keeps the cycle going
So far, it looks like the big benefit of Ascend is that you're almost always going to be casting these spells once you have 10 permanents
That ability snowballs fast
Annihilator 4 (Whenever this creature attacks, defending player sacrifices four permanents of their choice.) When Kozilek is put into a graveyard from anywhere, its owner shuffles their graveyard into their library
A card with beautiful artwork, Belle has been upgraded to an enchanted card with this reprint, giving her a unique look that's sure to be even more popular in Amethyst decks than her super rare version