As an another win condition if all types are on the battle field you win
When a challenge card is used, guess who is going to win. If you are correct, steal a card from the loser.
You may use a magic card without using an action point once per your turn
Choose a monster and swap it's target numbers. If you slay it draw a card.
At the end of your turn, you may discard a card. If you do, gain 1 action point.
when any player is challenged, play Rock Paper Scissors instead of rolling the dice