Guilds of Ravnica

Ritual of Soot | Sorcery | | Destroy all creatures with mana value 3 or less. | Dimitar Marinski

Erratic Cyclops | Creature | Cyclops Shaman | Trample Whenever you cast an instant or sorcery spell, Erratic Cyclops gets +X/+0 until end of turn, where X is that spell's mana value. | Milivoj Ćeran

Experimental Frenzy | Enchantment | | You may look at the top card of your library any time. You may play lands and cast spells from the top of your library. You can't play lands or cast spells from your hand. {3}{R}: Destroy Experimental Frenzy. | Simon Dominic

Beast Whisperer | Creature | Elf Druid | Whenever you cast a creature spell, draw a card. | Matt Stewart

Etrata, the Silencer | Legendary Creature | Vampire Assassin | Etrata, the Silencer can't be blocked. Whenever Etrata deals combat damage to a player, exile target creature that player controls and put a hit counter on that card. That player loses the game if they own three or more exiled cards with hit counters on them. Etrata's owner shuffles Etrata into their library. | Bastien L. Deharme

Connive | Sorcery | | Gain control of target creature with power 2 or less. | Dan Scott