You have at least eight artifact and/or creature cards in your graveyard.
({3} magic symbol) ({B} magic symbol) ({B} magic symbol) ({G} magic symbol) plus enough mana to pay for commander tax if applicable available.
Steps
Cast
Aatchik either from your hand or from the command zone by paying ({3} magic symbol) ({B} magic symbol) ({B} magic symbol) ({G} magic symbol) plus commander tax, if applicable.
When
Aatchik enters the battlefield, its first ability triggers, creating a 1/1 Insect creature token for each artifact and/or creature card in your graveyard.