War Rock Generations X TRAP During the Battle Phase, if your opponent controls more monsters than you do: Special Summon 1 "War Rock" monster from your Deck, and if you activated this card during your opponent's turn, for the rest of this turn while you control the face-up Special Summoned monster, your opponent's monsters cannot attack, except to attack that monster
Starting with the next opponent in turn order (or, if you cast Flare of Malice on an opponent's turn, starting with the opponent whose turn it is) and proceeding in turn order, each opponent chooses a creature or planeswalker with the greatest mana value among creatures and planeswalkers they control to sacrifice
Theres likely not going to be much of a need for that though, since Jeskai is a pretty easy color combination when it comes to generating massive pools of energy
The second new rarity is Iconic, and it looks to live up to that name
Cards similar to Kami of the Waning Moon include Gravelgill Duo, Hooded Kavu, Breach