There aren't many Gurimos or Jean Claud Magnums in DM, buuuuuuuuuut there's an industrial amount of such characters in GX
Its actually not a horrible strategy but theres just much better ways to get energies onto Pikachu ex than relying on a Stage 2 to do it
When Festival of Embers's last ability resolves, it will be exiled
While Brionac, Dragon of the Ice Barrier would be banned in the TCG in its pre-errata form before this strategy was released, they can still access Synchros not many other strategies could like Gungnir, Dragon of the Ice Barrier, who offered card destruction while being able to trigger your effects, and Dewloren, Tiger King of the Ice Barrier to put Atlanteans back in the hand for discard fodder
In a meta where dealing 1 damage to an opponents creature matters this is potentially: three mana kill a creature, deal 4 to opponent, draw a card and thats a great card
If a source you control would deal damage this turn, it deals that much damage plus 1 instead
