Cast Glasspool Mimic by paying ({2} magic symbol) ({U} magic symbol) , having it enter as a copy of Mikaeus.
Choose to have Glasspool Mimic put into your graveyard due to the legend rule.
Glasspool Mimic dies, triggering its undying ability, returning itself to the battlefield with no +1/+1 counters due to Solemnity, as a copy of Mikaeus.