I have some of these cards but never noticed until now
While Pokmon requiring multiple energy types (such as Dragon types needing Water, Fire, or Electric) are allowed, this approach is generally inefficient unless your deck is specifically built with ample energy support for those Pokmon
It can immediately be used for one colorless mana, and on its second turn gains the ability to create creature tokens
Search your library for a card with the same name as that card, reveal it, put it into your hand, then shuffle
Instant Silverback Elder Whenever you cast a creature spell, choose one Destroy target artifact or enchantment
Then you can use their shopping wizard to find sellers with the best options for you and especially finding sellers that has many cards you need so they can be sent in the same shipping.