Foundations

Herald of Eternal Dawn | Creature | Angel | Flash (You may cast this spell any time you could cast an instant.) Flying You can't lose the game and your opponents can't win the game. | Martina Fačková

Tolarian Terror | Creature | Serpent | This spell costs {1} less to cast for each instant and sorcery card in your graveyard. Ward {2} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.) | Vincent Christiaens

Rune-Scarred Demon | Creature | Demon | Flying When Rune-Scarred Demon enters, search your library for a card, put it into your hand, then shuffle. | Michael Komarck

Drakuseth, Maw of Flames | Legendary Creature | Dragon | Flying Whenever Drakuseth, Maw of Flames attacks, it deals 4 damage to any target and 3 damage to each of up to two other targets. | Grzegorz Rutkowski

Terror of Mount Velus | Creature | Dragon | Flying Double strike (This creature deals both first-strike and regular combat damage.) When this creature enters, creatures you control gain double strike until end of turn. | Billy Christian

Ghalta, Primal Hunger | Legendary Creature | Elder Dinosaur | This spell costs {X} less to cast, where X is the total power of creatures you control. Trample | Chase Stone

Koma, World-Eater | Legendary Creature | Serpent | This spell can't be countered. Trample, ward {4} Whenever Koma deals combat damage to a player, create four 3/3 blue Serpent creature tokens named Koma's Coil. | Mark Zug

Progenitus | Legendary Creature | Hydra Avatar | Protection from everything If Progenitus would be put into a graveyard from anywhere, reveal Progenitus and shuffle it into its owner's library instead. | Jaime Jones

Meteor Golem | Artifact Creature | Golem | When Meteor Golem enters, destroy target nonland permanent an opponent controls. | Lake Hurwitz

Sire of Seven Deaths | Creature | Eldrazi | First strike, vigilance Menace, trample Reach, lifelink Ward—Pay 7 life. | Lius Lasahido