Mr. Monokuma

Delve, frenzy 3, rampage 1, extort
{b}{r}: Regenerate Mr. Monokuma.
When Mr.Monokuma enters the battlefield, each player puts all creature cards in his/her hand onto the battlefield. When Mr. Monokuma is dealt combat damage by another creature, it deals 4 damage to that creature. At least one creature must attack and at least one creature must block each turn if able. At the beginning of the end step, if at least 4 creatures died this turn, exile Mr. Monokuma, then return it to the battlefield transformed.