Ring of Destruction
You can only activate 1 “Ring of Destruction” per turn. (1) During your opponent’s turn: Target 1 face-up monster your opponent controls whose ATK is lower than or equal to your opponent’s LP; destroy that face-up monster, and if you do, you take damage equal to that monster’s original ATK, and if you do that, inflict damage to your opponent equal to the damage you took.
Crush Card Virus
(1) Tribute 1 DARK monster you control with 1000 or less ATK; check your opponent’s hand and all monsters they control, and destroy all monsters with 1500 or more ATK, then, your opponent can destroy up to 3 monsters with 1500 or more ATK from their Deck. After you activated this card, all damage your opponent takes for the rest of this turn becomes 0.
Temple of the Kings
You can only use 1 “Temple of the Kings” effect per turn, and only once that turn. (1) You can activate 1 Trap Card you control during the turn it is Set. (2) You can send both this card and 1 face-up “Mystical Beast Serket” to the Graveyard; Special Summon 1 monster from your hand or Deck, or 1 Fusion Monster from your Extra Deck.
Exchange of the Spirit
You can only activate 1 “Exchange of the Spirit” per Duel. (1) If each player has 15 or more cards in their Graveyard: Pay 1000 Life Points; both players swaps cards in their Decks with cards in their Graveyards, then shuffle the Decks.
You can only use the effect of “Sinister Serpent” once per turn. (1) During your Standby Phase, if this card is in your Graveyard: Add this card to your hand. During your opponent’s next End Phase, banish 1 “Sinister Serpent” from your Graveyard.
Chaos Emperor Dragon get an errata too, but the real effect isn't confirmed yet.
That Ring of Destruction, though...
EDIT: CED's effect revealed:
Chaos Emperor Dragon – Envoy of the End
Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand) by banishing 1 LIGHT and 1 DARK monster from your Graveyard, and cannot be Special Summoned by other ways. During the turn you activate this card’s effect, you cannot activate other effects. (1) Once per turn: You can pay 1000 LP; send all cards on the field and in both players’ hands to the Graveyard, then inflict 300 damage to your opponent for each of your opponent’s cards sent by this effect.