Guilds of Ravnica

Book Devourer | Creature | Beast | Trample Whenever Book Devourer deals combat damage to a player, you may discard all the cards in your hand. If you do, draw that many cards. | Kev Walker

Inescapable Blaze | Instant | | This spell can't be countered. Inescapable Blaze deals 6 damage to any target. | Steve Argyle

Swathcutter Giant | Creature | Giant Soldier | Vigilance Whenever Swathcutter Giant attacks, it deals 1 damage to each creature defending player controls. | Aaron Miller

Niv-Mizzet, Parun | Legendary Creature | Dragon Wizard | This spell can't be countered. Flying Whenever you draw a card, Niv-Mizzet, Parun deals 1 damage to any target. Whenever a player casts an instant or sorcery spell, you draw a card. | Svetlin Velinov

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