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

Valkyrie's Call | Enchantment | | Whenever a nontoken, non-Angel creature you control dies, return that card to the battlefield under its owner's control with a +1/+1 counter on it. It has flying and is an Angel in addition to its other types. | Scott Murphy

Ajani, Caller of the Pride | Legendary Planeswalker | Ajani | +1: Put a +1/+1 counter on up to one target creature. −3: Target creature gains flying and double strike until end of turn. −8: Create X 2/2 white Cat creature tokens, where X is your life total. | D. Alexander Gregory

Kaito, Cunning Infiltrator | Legendary Planeswalker | Kaito | Whenever a creature you control deals combat damage to a player, put a loyalty counter on Kaito. +1: Up to one target creature you control can't be blocked this turn. Draw a card, then discard a card. −2: Create a 2/1 blue Ninja creature token. −9: You get an emblem with "Whenever a player casts a spell, you create a 2/1 blue Ninja creature token." | Evyn Fong

Sphinx of Forgotten Lore | Creature | Sphinx | Flash (You may cast this spell any time you could cast an instant.) Flying Whenever this creature attacks, target instant or sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to that card's mana cost. (You may cast that card from your graveyard for its flashback cost. Then exile it.) | Dmitry Burmak

Omniscience | Enchantment | | You may cast spells from your hand without paying their mana costs. | Jason Chan

Bloodthirsty Conqueror | Creature | Vampire Knight | Flying, deathtouch Whenever an opponent loses life, you gain that much life. (Damage causes loss of life.) | Dmitry Burmak

Liliana, Dreadhorde General | Legendary Planeswalker | Liliana | Whenever a creature you control dies, draw a card. +1: Create a 2/2 black Zombie creature token. −4: Each player sacrifices two creatures. −9: Each opponent chooses a permanent they control of each permanent type and sacrifices the rest. | Chris Rallis

Rise of the Dark Realms | Sorcery | | Put all creature cards from all graveyards onto the battlefield under your control. | Michael Komarck

Chandra, Flameshaper | Legendary Planeswalker | Chandra | +2: Add {R}{R}{R}. Exile the top three cards of your library. Choose one. You may play that card this turn. +1: Create a token that's a copy of target creature you control, except it has haste and "At the beginning of the end step, sacrifice this token." −4: Chandra deals 8 damage divided as you choose among any number of target creatures and/or planeswalkers. | Mark Winters

Rite of the Dragoncaller | Enchantment | | Whenever you cast an instant or sorcery spell, create a 5/5 red Dragon creature token with flying. | PINDURSKI

Twinflame Tyrant | Creature | Dragon | Flying If a source you control would deal damage to an opponent or a permanent an opponent controls, it deals double that damage instead. | Xabi Gaztelua

Quilled Greatwurm | Creature | Wurm | Trample Whenever a creature you control deals combat damage during your turn, put that many +1/+1 counters on it. (It must survive to get the counters.) You may cast this card from your graveyard by removing six counters from among creatures you control in addition to paying its other costs. | Michal Ivan

Doubling Season | Enchantment | | If an effect would create one or more tokens under your control, it creates twice that many of those tokens instead. If an effect would put one or more counters on a permanent you control, it puts twice that many of those counters on that permanent instead. | Chuck Lukacs

Vivien Reid | Legendary Planeswalker | Vivien | +1: Look at the top four cards of your library. You may reveal a creature or land card from among them and put it into your hand. Put the rest on the bottom of your library in a random order. −3: Destroy target artifact, enchantment, or creature with flying. −8: You get an emblem with "Creatures you control get +2/+2 and have vigilance, trample, and indestructible." | Anna Steinbauer

Niv-Mizzet, Visionary | Legendary Creature | Dragon Wizard | Flying You have no maximum hand size. Whenever a source you control deals noncombat damage to an opponent, you draw that many cards. | Dan Murayama Scott

Zimone, Paradox Sculptor | Legendary Creature | Human Wizard | At the beginning of combat on your turn, put a +1/+1 counter on each of up to two target creatures you control. {G}{U}, {T}: Double the number of each kind of counter on up to two target creatures and/or artifacts you control. | Nathaniel Himawan

Muldrotha, the Gravetide | Legendary Creature | Elemental Avatar | During each of your turns, you may play a land and cast a permanent spell of each permanent type from your graveyard. (If a card has multiple permanent types, choose one as you play it.) | Jason Rainville

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

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