RE: How could it work? Items + Spells - a few though about the expansion

Some of the interesting ones I could think of:

Dealing damage based on number of card types, e.g. if there are 5 melee cards on the board, the melee damage of the card will be 5, and if there are 5 magic cards on board, the magic damage of the card will be 5, which also means if a card type is killed, the damage will decrease accordingly
Sends a random card into hiding or to sleep, i.e. when the card is hidden/sleeping, it cannot attack and/or damage received is doubled
Hits a few random cards per attack, e.g. 1 ranged damage to 3 random cards on the board
Random (but not guaranteed) chance to deal more attacks (e.g. 50% chance to hit second time, 25% chance to hit third time)