Phenomenon cards work a little differently than traditional plane cards
While you can't pay alternative costs, you can pay additional costs when casting a spell with Cascade
I think Wizards needs to look at the (1)(U)(G) mana cost as there is also Uro, Titan of Natures Wrath
Mega Charizard X ex Phantasmal Flames 125/94 Mega Gengar ex Ascended Heroes 284/217 Mega Greninja ex Chaos Rising 116/086 Pikachu ex Ascended Heroes 276/217 Psyduck Ascended Heroes 226/217 Umbreon ex Prismatic Evolutions 161 Gengar [Reverse Holo] Perfect Order 050/088 Clefairy Perfect Order 094/088 Sliggoo Chaos Rising 095/086 Mega Greninja ex Chaos Rising 122/086 Mega Charizard X ex Phantasmal Flames 130/94 Mega Zygarde ex Perfect Order 120/088
That's not to say that it never has, or that it never will, or that you shouldn't use it
While the video game franchise has always been alive and kickin, Pokmon trading cards tend to find a way into mainstream media from time to time, usually when one sells for an absurd amount of money