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