O-Kagachi, Vengeful Kami

(As this Saga enters and after your draw step, add a lore counter.)

I — Exile target nonland permanent an opponent controls.

II — Return up to one other target nonland permanent to its owner's hand. Then each opponent discards a card.

III — Exile this Saga, then return it to the battlefield transformed under your control.

Flying, hexproof from multicolored

Whenever Niv-Mizzet deals combat damage to a player, it deals X damage to any target, target player draws X cards, and you gain X life, where X is the number of different color pairs among permanents you control that are exactly two colors.

Flying

Whenever this creature deals combat damage to a player, you may cast a spell from your hand without paying its mana cost.

Vigilance, menace, trample, haste

Whenever one or more Mutants, Ninjas, and/or Turtles you control deal combat damage to a player, put a +1/+1 counter on each of those creatures and draw a card.

Haste

At the beginning of each player's upkeep, that player untaps Karona and gains control of it.

Whenever Karona attacks, creatures of the creature type of your choice get +3/+3 until end of turn.

Flying

: Search your library for a Dragon permanent card and put it into your graveyard. If you do, Scion of the Ur-Dragon becomes a copy of that card until end of turn. Then shuffle.