Guilds of Ravnica

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

Deafening Clarion | Sorcery | | Choose one or both — • Deafening Clarion deals 3 damage to each creature. • Creatures you control gain lifelink until end of turn. | Adam Paquette

Skyknight Legionnaire | Creature | Human Knight | Flying, haste | Chase Stone

Tajic, Legion's Edge | Legendary Creature | Human Soldier | Haste Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.) Prevent all noncombat damage that would be dealt to other creatures you control. {R}{W}: Tajic, Legion's Edge gains first strike until end of turn. | Anthony Palumbo

Centaur Peacemaker | Creature | Centaur Cleric | When Centaur Peacemaker enters the battlefield, each player gains 4 life. | Raoul Vitale

Knight of Autumn | Creature | Dryad Knight | When Knight of Autumn enters the battlefield, choose one — • Put two +1/+1 counters on Knight of Autumn. • Destroy target artifact or enchantment. • You gain 4 life. | Ryan Pancoast

Ledev Champion | Creature | Elf Knight | Whenever Ledev Champion attacks, you may tap any number of untapped creatures you control. Ledev Champion gets +1/+1 until end of turn for each creature tapped this way. {3}{G}{W}: Create a 1/1 white Soldier creature token with lifelink. | Daarken

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