You want to always be attacking with Mirri, since it prevents all but one creature from blocking, allowing you to swing recklessly with the rest of your creatures
The likes of Waste Not, Harmonic Prodigy and Jeskas Will can help you get Kefka flipped quicker, by adding mana and doubling up on hand attack
To put that in perspective, "Uro, Titan of Nature's Wrath," the most expensive card from the previous magic expansion, Theros: Beyond Death , is currently going for $45
What attacks does Marill have
The cards are numbered to 82, but the 83rd card is a secret rare Dark Raichu holographic single (numbered 83/82) that was inserted on a limited basis into booster packs
He looks evil