what are shadowless pokemon cards Does Mean in Cards? Shadowless Base Set Complete Master

Being that it's a repeatable Mutate effect that just gets bigger and bigger, the effect could even bypass a Pacifism if you're going wide enough

They are balanced so that you'd get a large fraction of a card's worth of strength from the enters-the-battlefield effect on the front but would need to flip them for more than the average strength of a card

You don't have to be wearing the hat

Although there are five decks, four players is probably the sweet spot five player games will go longer, three player games will go faster (but have less of a multiplayer feel)

Whenever a creature is exiled from the battlefield, put a +1/+1 counter on this creature