Wilds of Eldraine

Realm-Scorcher Hellkite | Creature | Dragon | Bargain (You may sacrifice an artifact, enchantment, or token as you cast this spell.) Flying, haste When Realm-Scorcher Hellkite enters the battlefield, if it was bargained, add four mana in any combination of colors. {1}{R}: Realm-Scorcher Hellkite deals 1 damage to any target. | Billy Christian

Kellan, the Fae-Blooded | Legendary Creature | Human Faerie | Double strike Other creatures you control get +1/+0 for each Aura and Equipment attached to Kellan, the Fae-Blooded. | Anna Steinbauer

Rowan, Scion of War | Legendary Creature | Human Wizard | Menace {T}: Spells you cast this turn that are black and/or red cost {X} less to cast, where X is the amount of life you lost this turn. Activate only as a sorcery. | Magali Villeneuve

Agatha of the Vile Cauldron | Legendary Creature | Human Warlock | Activated abilities of creatures you control cost X less to activate, where X is Agatha of the Vile Cauldron's power. This effect can't reduce the mana in that cost to less than one mana. {4}{R}{G}: Other creatures you control get +1/+1 and gain trample and haste until end of turn. | Jason A. Engle

Beluna Grandsquall | Legendary Creature | Giant Noble | Trample Permanent spells you cast that have an Adventure cost {1} less to cast. | Victor Adame Minguez