Guilds of Ravnica

Cosmotronic Wave | Sorcery | | Cosmotronic Wave deals 1 damage to each creature your opponents control. Creatures your opponents control can't block this turn. | Titus Lunter

Gravitic Punch | Sorcery | | Target creature you control deals damage equal to its power to target player. Jump-start (You may cast this card from your graveyard by discarding a card in addition to paying its other costs. Then exile this card.) | Randy Vargas

Rubblebelt Boar | Creature | Boar | When Rubblebelt Boar enters the battlefield, target creature gets +2/+0 until end of turn. | Tomasz Jedruszek

Hammer Dropper | Creature | Giant Soldier | Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.) | Lake Hurwitz