The Star level only goes to 8 stars and also if you wanted to create a card that has the star level on the opposite side such as xyz cards you can not because the stars only align on the right as opposed to either left or right
All that said, you may not need to do anything special at all to make good use of Molten Vortex
Chandra, Flameshaper Marcy: The ultimate is pretty meh, she's VERY expensive, and the best thing she can do is give you 3 of that mana back the turn she hits the table and maybe help you fish for an answer
Snapcaster Mage The runner up for today is none other than Snapcaster Mage, the strongest of the Magic Invitational Cards designed by MTG champions
3 | Metallic Mimic Mana Value: 2 Rarity: Rare Type: Artifact Creature Shapeshifter Stats: 2/1 Card Text: As Metallic Mimic enters, choose a creature type
You can obtain the other two decks you didnt choose by completing missions in the Unlimited Missions tab, which just involve you completing a certain number of ranked duels