Ravnica Allegiance

Flames of the Raze-Boar | Instant | | Flames of the Raze-Boar deals 4 damage to target creature an opponent controls. Then Flames of the Raze-Boar deals 2 damage to each other creature that player controls if you control a creature with power 4 or greater. | Jason A. Engle

Mirror March | Enchantment | | Whenever a nontoken creature enters the battlefield under your control, flip a coin until you lose a flip. For each flip you won, create a token that's a copy of that creature. Those tokens gain haste. Exile them at the beginning of the next end step. | Johannes Voss

Rumbling Ruin | Creature | Elemental | When Rumbling Ruin enters the battlefield, count the number of +1/+1 counters on creatures you control. Creatures your opponents control with power less than or equal to that number can't block this turn. | Jakub Kasper

Rakdos, the Showstopper | Legendary Creature | Demon | Flying, trample When Rakdos, the Showstopper enters the battlefield, flip a coin for each creature that isn't a Demon, Devil, or Imp. Destroy each creature whose coin comes up tails. | Viktor Titov

Ravager Wurm | Creature | Wurm | Riot (This creature enters the battlefield with your choice of a +1/+1 counter or haste.) When Ravager Wurm enters the battlefield, choose up to one — • Ravager Wurm fights target creature you don't control. • Destroy target land with an activated ability that isn't a mana ability. | Svetlin Velinov