Enter Diregraf Rebirth
Like most Pokmon cards, the value of Ho-Oh LEGEND depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (HeartGold & SoulSilver)
All of their Monsters are easy to special summon, making Endymion a must-run engine in just about every Pendulum deck
In a game where drawing cards is pretty much the primary resource, especially during Yatas heyday, this was dooming an opponent to an automatic loss
With high HP and powerful attacks like Brave Wing and Explosive Vortex, Charizard, as always, is a force to be reckoned with
This means you could put this mana into something like Urza's Ruinous Blast or Karn's Temporal Sundering at a pivotal moment