Flare Cycle The Flare cycle from Modern Horizons 3 consists of five cards that can be cast for free by sacrificing a nontoken creature of the appropriate color: Each of them are perfectly reasonable cards, especially Flare of Denial given the power of free counters and Flare of Malice since it negates the inherent weakness of a two-for-one by removing multiple cards
Kindred will replace tribal as a card type, affecting a group of cards first introduced in the portentous Future Sight set and later explored in depth during the Lorewyn block
Burning Abyss With a new support in Beatrice, Lady of the Eternal , Burning Abyss could now send a specific card from their deck to graveyard and not just hope for a random chance with Dante, Traveler of the Burning Abyss
Removal As a mono-blue deck, we don't have any hard removal, so we make do with Callous Dismissal
Solemn Warning X TRAP Counter When a monster(s) would be Summoned, OR when a Spell/Trap Card, or monster effect, is activated that includes an effect that Special Summons a monster(s): Pay 2000 LP