pokemon x y cards XY: Roaring Skies this booster pack is thoughtfully designed to infuse excitement and strategy into your matches High Class Best of XY

Massive card advantage is at the top of this enchantment's job description: Underworld Breach turns your graveyard into a (huge) extension of your hand, and basically provides flashback to anything you cast

Its a landfall payoff, plus it puts a land into play

And then

#0136 Flareon Total Market Price $4,904.52 72 cards priced 2026-07-22 Avg Card Price $68.12 High Card $1999.95 Low Card $0.28 Flareon card prices have gained 44.3% year-to-date and is up 1.8% over the past 30 days, with 72 cards ranging from $0.28 to $1999.95

I did a quick search for decklists that run this but couldnt find anything too interesting

This treatment increases the value of a card as well, sometimes drastically with cards like Atraxa, Praetors' Voice seeing a nearly $80 spike with the treatment, but others not so much