For some reason, these worry me, mostly because of the "Draw a card." For example, one could use the
version of this, Quantum Towers (and/or Time Towers, but one Quantum Tower provides enough fuel for one of these), and Precognitions to get an amazing amount of draw, even in the first turn. Do it right, and the deck could probably spam (for example) Silurian Dragons for its win condition, and do it so quickly that most decks would have a hard time keeping up. Then again, I could be worrying over nothing, so... take this for what it's worth.