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.

The first activated ability of an artifact you activate each turn costs less to activate.

+1: Draw two cards. Then discard two cards unless you discard an artifact card.

−2: Target artifact becomes an artifact creature. If it isn't a Vehicle, it has base power and toughness 4/4.

−6: You get an emblem with "Whenever an artifact you control becomes tapped, draw a card."

Viridian Betrayers has infect as long as an opponent is poisoned. (It deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)