Doubling effects are highly dangerous, because now every pump spell does double damage, and there may even be other things that can double the effect again
Is this particular McDonalds regularly serving Happy Meals to the entire Nurse Joy or Officer Jenny clan?) We are, unfortunately, residents of a college town with a fairly active Pokmon Go community, so, despite the scalper-deterring sign, this place too is entirely out of cards
On a result of 20, repeat this process
[When Attacking] If you have 10 or more cards in your trash, give up to 1 of your opponent's Characters 2000 power during this turn
Two mana to activate goes some of the way to keeping it more balanced, but its still a monster of a card in all sorts of decks