Dominaria

Rona, Disciple of Gix | Legendary Creature | Human Artificer | When Rona, Disciple of Gix enters the battlefield, you may exile target historic card from your graveyard. (Artifacts, legendaries, and Sagas are historic.) You may cast spells from among cards exiled with Rona. {4}, {T}: Exile the top card of your library. | Tommy Arnold

Adeliz, the Cinder Wind | Legendary Creature | Human Wizard | Flying, haste Whenever you cast an instant or sorcery spell, Wizards you control get +1/+1 until end of turn. | Zezhou Chen

Slimefoot, the Stowaway | Legendary Creature | Fungus | Whenever a Saproling you control dies, Slimefoot, the Stowaway deals 1 damage to each opponent and you gain 1 life. {4}: Create a 1/1 green Saproling creature token. | Alex Konstad

Hallar, the Firefletcher | Legendary Creature | Elf Archer | Trample Whenever you cast a spell, if that spell was kicked, put a +1/+1 counter on Hallar, the Firefletcher, then Hallar deals damage equal to the number of +1/+1 counters on it to each opponent. | Bram Sels