It is very good when used in battle, as players can switch up to three cards from their deck at the cost of just one energy
If you cast a card with prototype for its alternate cost, that becomes the mana cost of the card
Feel free to post any you feel deserve better treatment below
Can you provide a couple examples of cards that are switched around so we can see how the messages change
The first thing you're going to want to do is figure out a method to pick which colors you'll be playing
Playing The Fourth Doctor, as portrayed by Tom Baker, will allow the player to look at the top card of their library whenever they like, as well as active the Would you Like A...? ability a reference to this Doctors love of Jelly Babies which enables the player to, once per turn, play a historic land or cast a historic spell from the top of their library