You do have to discard an Energy after attacking, but Fire decks have no shortage of acceleration options to make that cost manageable
Red removal spells such as Lunge and Shock Troops were turns too late to keep the Bouncer offline, and so a smart player could basically keep his Bouncer around indefinitely, use it to dominate the board, and ride it straight to victory
Such is the case with Darkrai EX anyway, so consider switching one Nihilego for Giratina EX, giving rise to a new brand of the notorious DarkTina set (DragDarkTina, anyone?)
It was a green card mistakenly printed with a blue border, with one copy selling for over $90,000
Windborn Muse is a budget card that makes it more difficult for an opponent to attack you and take the monarch from you, while cards like Kardur, Doomscourge push opponents to attack each other rather than you
The one that got the biggest consideration from me was Auspicious Starrix, because getting it once was enough