If you choose to use this card in a deck, I wouldn't use more than 1, and I would make sure to have at least 1 Iris supporter card in your deck so you can use Strong Bond the first time when Axew is in the active Pokemon spot, then use Dragon Claw the second turn and play the Iris supporter card that turn allowing you to do 10 damage more for each Prize card your opponent has taken
One of the best fight spells of all time, especially in Dino builds, this card will almost always be picking off one of your foes biggest threats, as Dinosaur creatures typically have meaty power and toughness quotients
For five mana, all players exile all their creatures from their graveyards
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Or is it, and I do worry its this, that the SIRs in Phantasmal Flames just arent that appealing