Theres no other way of putting it, Rapidash EX is a poor EX card
Cards with H," I, and J regulation marks will be legal to use (as will any future regulation marks that may be released)
As of M10, they follow the rules of a characteristic creature
These cards are worded specifically to bend the rules of Magic, letting you play as many of them in your deck, with a bonus or two for having more of them in play or having played them during a game
But if you are playing an Eldrazi deck, you aren't here to make friends
though powerful, they can be tricky to use, given that youll need very specific Energy cards attached to them in order for them to be used