Guilds of Ravnica

Kraul Swarm | Creature | Insect Warrior | Flying {2}{B}, Discard a creature card: Return Kraul Swarm from your graveyard to your hand. | Jehan Choo

Hellkite Whelp | Creature | Dragon | Flying Whenever Hellkite Whelp attacks, it deals 1 damage to target creature defending player controls. | Johann Bodin

Street Riot | Enchantment | | As long as it's your turn, creatures you control get +1/+0 and have trample. | Tomasz Jedruszek

Join Shields | Instant | | Untap all creatures you control. They gain hexproof and indestructible until end of turn. (They can't be the targets of spells or abilities your opponents control. Damage and effects that say "destroy" don't destroy them.) | Winona Nelson