Wilds of Eldraine

Moonshaker Cavalry | Creature | Spirit Knight | Flying When Moonshaker Cavalry enters the battlefield, creatures you control gain flying and get +X/+X until end of turn, where X is the number of creatures you control. | Aldo Domínguez

Hylda of the Icy Crown | Legendary Creature | Human Warlock | Whenever you tap an untapped creature an opponent controls, you may pay {1}. When you do, choose one — • Create a 4/4 white and blue Elemental creature token. • Put a +1/+1 counter on each creature you control. • Scry 2, then draw a card. | Ekaterina Burmak

Will, Scion of Peace | Legendary Creature | Human Wizard | Vigilance {T}: Spells you cast this turn that are white and/or blue cost {X} less to cast, where X is the amount of life you gained this turn. Activate only as a sorcery. | Ryan Pancoast

Eriette of the Charmed Apple | Legendary Creature | Human Warlock | Each creature that's enchanted by an Aura you control can't attack you or planeswalkers you control. At the beginning of your end step, each opponent loses X life and you gain X life, where X is the number of Auras you control. | Magali Villeneuve