Woebringer Demon

Flying
At the beginning of each player's upkeep, that player sacrifices a creature of their choice. If the player can't, sacrifice this creature.

Barbarian Riftcutter

{R}, Sacrifice this creature: Destroy target land.

Blockbuster

{1}{R}, Sacrifice this enchantment: It deals 3 damage to each tapped creature and each player.

Breath of Fury

Enchant creature you control
When enchanted creature deals combat damage to a player, sacrifice it and attach this Aura to a creature you control. If you do, untap all creatures you control and after this phase, there is an additional combat phase.

Char

Char deals 4 damage to any target and 2 damage to you.

Cleansing Beam

Radiance — Cleansing Beam deals 2 damage to target creature and each other creature that shares a color with it.

Coalhauler Swine

Whenever this creature is dealt damage, it deals that much damage to each player.

Courier Hawk

Dogpile

Dogpile deals damage to any target equal to the number of attacking creatures you control.

Excruciator

Damage that would be dealt by this creature can't be prevented.

Fiery Conclusion

As an additional cost to cast this spell, sacrifice a creature.
Fiery Conclusion deals 5 damage to target creature.

Flame Fusillade

Until end of turn, permanents you control gain "{T}: This permanent deals 1 damage to any target."

Flash Conscription

Untap target creature and gain control of it until end of turn. That creature gains haste until end of turn. If {W} was spent to cast this spell, the creature gains "Whenever this creature deals combat damage, you gain that much life" until end of turn.

Frenzied Goblin

Whenever this creature attacks, you may pay {R}. If you do, target creature can't block this turn.

Galvanic Arc

Enchant creature
When this Aura enters, it deals 3 damage to any target.
Enchanted creature has first strike.

Goblin Fire Fiend

Haste
This creature must be blocked if able.
{R}: This creature gets +1/+0 until end of turn.

Ravnica: City of Guilds