Core Set 2020

Corpse Knight | Creature | Zombie Knight | Whenever another creature enters the battlefield under your control, each opponent loses 1 life. | Karl Kopinski

Kaalia, Zenith Seeker | Legendary Creature | Human Cleric | Flying, vigilance When Kaalia, Zenith Seeker enters the battlefield, look at the top six cards of your library. You may reveal an Angel card, a Demon card, and/or a Dragon card from among them and put them into your hand. Put the rest on the bottom of your library in a random order. | Yongjae Choi

Kethis, the Hidden Hand | Legendary Creature | Elf Advisor | Legendary spells you cast cost {1} less to cast. Exile two legendary cards from your graveyard: Until end of turn, each legendary card in your graveyard gains "You may play this card from your graveyard." | Yongjae Choi