Moritte of the Frost | Staff of Eden, Vault's Key | Marit Lage's Slumber

Cards

({2} magic symbol) ({G} magic symbol) ({U} magic symbol) ({U} magic symbol) plus enough mana to pay for commander tax, if applicable available.

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
Marit Lage's Slumber's first ability trigger.
Resolve the Marit Lage Slumber trigger, causing you to scry 1.
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.
Repeat from step 2.