Moritte of the Frost in hand or in the command zone.
Staff of Eden and Simulacrum Synthesizer on the battlefield.
({2} magic symbol) ({G} magic symbol) ({U} magic symbol) ({U} magic symbol) plus enough mana to pay for commander tax, if applicable available.
Steps
Cast Moritte of the Frost from your hand or from the command zone by paying ({2} magic symbol) ({G} magic symbol) ({U} magic symbol) ({U} magic symbol) plus commander tax, if applicable, choosing to have it enter the battlefield as a copy of Staff of Eden.
Put Moritte of the Frost into your graveyard due to the legend rule.
Morrite of the Frost's enters-the-battlefield ability and Simulacrum Synthesizer's second ability trigger.
Resolve the Simulacrum Synthesizer trigger, creating a 0/0 Construct artifact creature token.
Resolve the Moritte of the Frost trigger, returning Moritte of the Frost from your graveyard to the battlefield as a copy of Staff of Eden.