When Aatchik enters, create a 1/1 green Insect creature token for each artifact and/or creature card in your graveyard.
Whenever another Insect you control dies, put a +1/+1 counter on Aatchik. Each opponent loses 1 life.
Aatchik is a BG Insect tribal aristocrats commander: flood the board with Insect tokens, then sacrifice them for value while draining the table 1 life per death and growing Aatchik into a threat. You self-mill or fill the graveyard early so Aatchik's ETB makes a swarm, then loop sac outlets and token generators to grind incremental damage and value.
Built-in token generation that scales with a full graveyard and recurs each time you recast Aatchik
Free, repeatable life drain that wins through board wipes and sacrifice rather than combat
Aatchik becomes a real beater via +1/+1 counters as your Insects die
BG gives premier recursion, ramp, and graveyard synergy
The drain only triggers on Insects dying, so non-Insect tokens don't advance the kill
Relies on a stocked graveyard, so graveyard hate sets it back hard
Commander tax punishes a board-wipe-into-recast plan over multiple games
Can be slow and grindy against fast combo decks without interaction
Pumps your whole board whenever you sacrifice, turning Insect deaths into a lethal swing.
Add fast mana and reliable sac outlets (Viscera Seer, Carrion Feeder, Goblin Bombardment) so deaths are free and repeatable, then build a graveyard fill engine and a recursion piece to loop Aatchik or token makers. Tutors like Diabolic Intent and Demonic Tutor find your altar plus a payoff, and dedicated Insect synergy (Hornet Queen, The Locust God effects in green-black equivalents, Scute Swarm) maximizes the death-trigger drain toward a deterministic finish.