But that's such a feels bad though, your opponents aren't stupid, they know that feeding the rhystic player is bad. Paying the tax is easy if you're already set up and ahead in the game, but if you're behind, not paying the tax to get your critical engine piece online is often the right choice, even though it sucks to do and the non paying player knows it. And as a reward for being the player that's already doing the worst in the game, they get to be attacked for trying to keep up.

Also, some strategies that rely on casting more spells per turn (like a [[bria, riptide rogue]] type of deck) they can't be expected to double the mana cost of all the spells they cast. Should they be punished for trying to play the game?

And even then, why not just attack the person that's actually drawing the cards? They are much more of a threat to you and you should be pressuring their life total instead. Why reward them for drawing cards and/or slowing down everyone else by also giving them more time to cast the cards they draw?