Intimidate (This creature can't be blocked except by artifact creatures and/or creatures that share a color with it.)
: Put target artifact or creature card with mana value X from an opponent's graveyard onto the battlefield under your control tapped. Then that player mills X cards.
Geth is a mono-black graveyard-control commander: fill opponents' yards (or wait for them to do it), then pay to reanimate their best artifacts and creatures under your control while milling them further. You grind out value every turn, hijacking removal-magnets and big threats, and eventually overwhelm the table with stolen bodies or close with a reanimated bomb.
Repeatable, instant-speed-adjacent value engine that turns opponents' best cards into your own without card investment
Color-fixed mono-black gives access to the deck's best tutors, ramp, and recursion
Mill component eventually decks opponents out or feeds your own grave strategies
Intimidate makes Geth himself a sneaky source of commander damage in mono-color pods
Reliant on opponents having good targets in their graveyards—graveyard hate (Rest in Peace, Leyline of the Void) shuts him off entirely
Six mana and his ability is mana-hungry; needs lots of ramp to activate meaningfully
Mono-black means no counterspells or blue card draw to protect the engine
Slow to close games on its own without a payoff—pure value can stall
Lets you cast off the top to keep pace, fueling the mana-hungry engine.
Lean hard into mana acceleration—add Nirkana Revenant, Crypt Ghast, Magus of the Coffers, and Black Market Connections to enable huge X values. Include self-mill enablers and reanimation backups (Reanimate, Animate Dead, Victimize) so you're not solely dependent on opponents filling their yards, plus targeted grave fillers like Hymn-style discard. Finally, add protection and a faster clock—Sword of Feast and Famine, Whip of Erebos, or Liliana of the Dark Realms—so your stolen value actually converts to wins.
Legendary Creature — Phyrexian Zombie
