Dominaria

Grand Warlord Radha | Legendary Creature | Elf Warrior | Haste Whenever one or more creatures you control attack, add that much mana in any combination of {R} and/or {G}. Until end of turn, you don't lose this mana as steps and phases end. | Anna Steinbauer

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

Jodah, Archmage Eternal | Legendary Creature | Human Wizard | Flying You may pay {W}{U}{B}{R}{G} rather than pay the mana cost for spells that you cast. | Yongjae Choi

Darigaaz Reincarnated | Legendary Creature | Dragon | Flying, trample, haste If Darigaaz Reincarnated would die, instead exile it with three egg counters on it. At the beginning of your upkeep, if Darigaaz is exiled with an egg counter on it, remove an egg counter from it. Then if Darigaaz has no egg counters on it, return it to the battlefield. | Grzegorz Rutkowski