Is revealing a card as bad as paying 1 life? This seems a bit good (and a random card slows things down quite a bit)

Well, in my set there soon will be more cards that will prey on knowledge of cards in hand. Also they cannot tap for coloured mana if you have no cards in hand.

Whether or not the drawback is appropriate, it certainly is annoying. It's roughly equivalent to "At the beginning of your turn, shuffle your library." Or maybe "Roll this die, until you roll a 6, then continue playing." Who wants to do that every turn?

mace20: It's the "at random" part that's annoying. How about ", Reveal two cards from your hand:"? More knowledge at first, but you can keep showing the same 2 cards turn after turn.

Also, as duals that can produce either colour mana on turn 1, these would be rare by Wizards' design standards. (They'd be absolute staples in constructed, where your first spell likely gives away 50% of your decklist anyway.)