Exterminatus

Flying My Will Be Done — Whenever Szarekh attacks, mill three cards. You may put an artifact creature card or Vehicle card from among the cards milled this way into your hand.

Trample Mark of Chaos Ascendant — During your turn, spells you cast from your hand with mana value X or less have cascade, where X is the total amount of life your opponents have lost this turn.

(T: Add B.)

(T: Add R.)

T: Add C. T: Add U or B. This artifact deals 1 damage to you.

Vigilance Unquestionable Wisdom — Other creatures you control get +1/+0 and have vigilance. Hunt for Heresy — 1, T: Tap target creature an opponent controls. Investigate. (Create a Clue token. It's an artifact with "2, Sacrifice this token: Draw a card.")

Rapid Regeneration — The Swarmlord enters with two +1/+1 counters on it for each time you've cast your commander from the command zone this game. Xenos Cunning — Whenever a creature you control with a counter on it dies, draw a card.

Phaeron — Whenever one or more artifact cards leave your graveyard, create two 2/2 black Necron Warrior artifact creature tokens. Grand Strategist — At the beginning of combat on your turn, another target artifact creature you control gets +2/+2 and gains menace until end of turn.