Guilds of Ravnica

Aurelia, Exemplar of Justice | Legendary Creature | Angel | Flying Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.) At the beginning of combat on your turn, choose up to one target creature you control. Until end of turn, that creature gets +2/+0, gains trample if it's red, and gains vigilance if it's white. | Chris Rahn

Chance for Glory | Instant | | Creatures you control gain indestructible. Take an extra turn after this one. At the beginning of that turn's end step, you lose the game. | Bram Sels

March of the Multitudes | Instant | | Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.) Create X 1/1 white Soldier creature tokens with lifelink. | Zack Stella

Trostani Discordant | Legendary Creature | Dryad | Other creatures you control get +1/+1. When Trostani Discordant enters the battlefield, create two 1/1 white Soldier creature tokens with lifelink. At the beginning of your end step, each player gains control of all creatures they own. | Chase Stone

Lazav, the Multifarious | Legendary Creature | Shapeshifter | When Lazav, the Multifarious enters the battlefield, surveil 1. (Look at the top card of your library. You may put it into your graveyard.) {X}: Lazav, the Multifarious becomes a copy of target creature card in your graveyard with mana value X, except its name is Lazav, the Multifarious, it's legendary in addition to its other types, and it has this ability. | Yongjae Choi

Mnemonic Betrayal | Sorcery | | Exile all opponents' graveyards. You may cast spells from among those cards this turn, and you may spend mana as though it were mana of any type to cast those spells. At the beginning of the next end step, if any of those cards remain exiled, return them to their owners' graveyards. Exile Mnemonic Betrayal. | Clint Cearley

Ral, Izzet Viceroy | Legendary Planeswalker | Ral | +1: Look at the top two cards of your library. Put one of them into your hand and the other into your graveyard. −3: Ral, Izzet Viceroy deals damage to target creature equal to the total number of instant and sorcery cards you own in exile and in your graveyard. −8: You get an emblem with "Whenever you cast an instant or sorcery spell, this emblem deals 4 damage to any target and you draw two cards." | Kieran Yanner

Thousand-Year Storm | Enchantment | | Whenever you cast an instant or sorcery spell, copy it for each other instant and sorcery spell you've cast before it this turn. You may choose new targets for the copies. | Dimitar Marinski

Underrealm Lich | Creature | Zombie Elf Shaman | If you would draw a card, instead look at the top three cards of your library, then put one into your hand and the rest into your graveyard. Pay 4 life: Underrealm Lich gains indestructible until end of turn. Tap it. | Anna Steinbauer

Vraska, Golgari Queen | Legendary Planeswalker | Vraska | +2: You may sacrifice another permanent. If you do, you gain 1 life and draw a card. −3: Destroy target nonland permanent with mana value 3 or less. −9: You get an emblem with "Whenever a creature you control deals combat damage to a player, that player loses the game." | Magali Villeneuve