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Passimian [Pikachu's Easter] #57/SM-P Pokemon Japanese Promo Keep track of your collection value over time

The mana value might keep it out of many decks, but Firesong and Sunspeaker has great value for Boros burn decks

Thats when Nintendo apparently got involved

You can play it with the old Greninja ex from Twilight Masquerade, to get what you need with Shinobi Blade and prepare everything for Mega Greninja to come sweeping the field with both Mortal Shuriken and Ninja Spinner

The quick answer is the sets that are about to rotate out of Standard tend to be the cheapest

For Pokmon trading cards collectors : this Diancie Holo 71/119 card is considered as Rare Holo, Holographic Variation card.