Aftershock

Destroy target artifact, creature, or land. Aftershock deals 3 damage to you.

Aether Flash

Whenever a creature enters the battlefield, Aether Flash deals 2 damage to it.

Khârn the Betrayer

Berzerker — Khârn the Betrayer attacks or blocks each combat if able.
Sigil of Corruption — When you lose control of Khârn the Betrayer, draw two cards.
The Betrayer — If damage would be dealt to Khârn the Betrayer, prevent that damage and an opponent of your choice gains control of it.

An-Zerrin Ruins

As An-Zerrin Ruins enters the battlefield, choose a creature type.
Creatures of the chosen type don't untap during their controllers' untap steps.