Very interesting ideas! The card-burning benefits are interesting, also the extra energy part.

In general, there always needs to be a balance between rewards for those who hold SPS, without giving too much advantage. Right now, I see the gameplay quite balanced with a good mix of pay to win and play to win - you can have fun without the OP cards, but you'll probably not play as high or win against them. But it doesn't destroy the fun of the game.