Update: It turns out that these new cards were for the surprise The Game Awards After Party Event! Check out the decklists and full card spoilers here!
The data files in the latest 1.03.00 game update revealed some unspoiled cards from Theros: Beyond Death and some art! The cards included in the MTG Arena client include the previously revealed Elspeth, Sun's Nemesis and Ashiok, Nightmare Muse – and the others are all in their colors (white, blue and black).
Since both of their respective bundles are available for preorder as well, we could have see a preconstructed deck event similar to what we had in the Eldraine Courtside Brawl event, as part of a preview event before the set launches. It could also be related to the Game Awards announcement starting at 5:30 PM PST! Thanks to u/TechnomagusPrime and u/yail03 from reddit for unpacking the information below.
Daxos, Blessed by the Sun WW
Legendary Enchantment Creature – Demigod (Uncommon)
Daxos’s toughness is equal to your devotion to white.
Whenever another creature you control enters the battlefield or dies, you gain 1 life.
Hero of the Winds 3W
Creature — Human Soldier
Whenever you cast a spell that targets Hero of the Winds, creatures you control get +1/+0 until end of turn.
To tame a griffin is to ride into legend.
Eidolon of Philosophy U
Enchantment Creature — Spirit
6U, Sacrifice Eidolon of Philosophy: Draw three cards.
And what did Erekastos teach us is the nature of the soul?
Memory Drain 2UU
Counter target spell. Scry 2.
Alythos sat and stared blankly out over the glassy oceans of Nerono, trying in vain to remember what he knew he had forgotten.
Inevitable End 2B
Enchantment — Aura
Enchanted creature has “At the beginning of your upkeep, sacrifice a creature.”
“How many more will die before you accept your fate?”
—Erebos, God of the Dead
Mire’s Grasp 1B
Enchantment — Aura
Enchanted creature gets -3/-3
Those caught attempting to escape the Underworld spend the rest of their existence trapped in the Mire of Punishment.
This is the art for Daxos, Blessed by the Sun, illustrated by Lius Lasahido.
This is the art for the Nightmare Token generated by Ashiok, Nightmare Muse revealed yesterday.