Some useful resources to learn more are as follows: PokeInvesting, a subreddit dedicated to Pokmon investing and finance, where you can find news, discussions, advice, and analysis from other Pokevestors
Five of them (Arena,Giant Badger,Mana Crypt, Sewers of Estark, and Windseeker Centaur) were promotional cards that could be attained by sending in forms found inside early Magic novels
Here are the full decklists: Sorins Hunt and Feed Tibalts Torment and Agonise But there is more
Cloud, Midgar Mercenary doesn't have any built-in protection, and a lousy one toughness, so you'll need a handful of ways to protect him
But they're safe from removal, coming back into play as their regular non-creature-y selves
And it's a house in Bloomburrow Sealed and Drafts