Theros Beyond Death

Archon of Sun's Grace | Creature | Archon | Flying, lifelink Pegasus creatures you control have lifelink. Constellation — Whenever an enchantment enters the battlefield under your control, create a 2/2 white Pegasus creature token with flying. | Matt Stewart

Nightmare Shepherd | Enchantment Creature | Demon | Flying Whenever another nontoken creature you control dies, you may exile it. If you do, create a token that's a copy of that creature, except it's 1/1 and it's a Nightmare in addition to its other types. | Tyler Jacobson

Tectonic Giant | Creature | Elemental Giant | Whenever Tectonic Giant attacks or becomes the target of a spell an opponent controls, choose one — • Tectonic Giant deals 3 damage to each opponent. • Exile the top two cards of your library. Choose one of them. Until the end of your next turn, you may play that card. | Slawomir Maniak

Arasta of the Endless Web | Legendary Enchantment Creature | Spider | Reach Whenever an opponent casts an instant or sorcery spell, create a 1/2 green Spider creature token with reach. | Sam Rowan

Haktos the Unscarred | Legendary Creature | Human Warrior | Haktos the Unscarred attacks each combat if able. As Haktos enters the battlefield, choose 2, 3, or 4 at random. Haktos has protection from each mana value other than the chosen number. | Ryan Pancoast

Atris, Oracle of Half-Truths | Legendary Creature | Human Advisor | Menace When Atris, Oracle of Half-Truths enters the battlefield, target opponent looks at the top three cards of your library and separates them into a face-down pile and a face-up pile. Put one pile into your hand and the other into your graveyard. | Bastien L. Deharme