At just shy of $950, Ancient Origins takes the tentative crown for the most expensive X&Y sets, but Phantom Forces may have something to say about that once there's more sold data to observe.
Once per turn, during your Main Phase: You can excavate the top card of your Deck, and if it is a FIRE Dragon monster, send it to the GY, and if you do, this card gains 1000 ATK for each "Dora Dora" you control
Its a powerful card and can be quite annoying to play against if youre not prepared
It's a great Chocobo (and generic Bird) support card, helping to get a card into your hand and a ton of lands on the battlefield
If you build the deck correctly with subsequent supportive attackers from the Fusion Strike series, then you have a way to quickly weaponise your Mew V Max and Genesect V so you can OHKO almost any Pokmon
Knowing what cards are good in Commander is one of the first steps towards becoming well-versed in the format, but knowing why certain cards are good is even more important