pokemon card list printable checklist File:EX Crystal Guardians checklist.pdf Pokémon TCG - Perfect Order

You cant lose speed and opponent's can not remove your speed unless a card specifically says so , as is the case with Spikeshell Harrier, which references the blue shells from the Mario Kart franchise

A transforming double-faced card enters with its front face up by default, unless a spell or ability instructs you to put it onto the battlefield transformed or allows you to cast it transformed, in which case it enters with its back face up

The crown jewel is Charizard VMAX Shiny (#308), worth approximately 40,000 ($284)

Of course, if you can use the mana better, you can change the symmetric effect to your advantage, and theres a chance there were decks that could do just this