If you cast a spell for another cost "rather than pay" its mana cost, you can't choose to cast it for any other alternative cost
I hesitate to call Aurora Phoenix a powerhouse card, and if anything Im learning that phoenix creatures arent really at their best in Commander
The announcements were made in light of MagicCon: Las Vegas this past October, and a detailed outline of the plans for MTG's future can be found on the official Magic: The Gathering website
Number 7 Language English Legal Formats Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Timeless, Vintage Not Legal Formats Alchemy, Pauper, Pioneer, Standard Rulings (3/16/2018) A mana cost of means that you pay twice X
Rabanastre, Royal City (18/53) Shahab Allzadeh Alizadeh is responsible for multiple gorgeous cards from the MTG x FF set, including Suken Ruins and Underground River, but this sweeping view of The Royal City of Rabanastre is by far the most breathtaking