Prison Break in hand or in your graveyard (was discarded this turn).
Notable Prerequisites
You have a creature card in your graveyard.
Mana Needed
({5} magic symbol) ({B} magic symbol) ({R} magic symbol) ({R} magic symbol) at most available.
Steps
Cast
Prison Break either from your hand by paying ({4} magic symbol) ({B} magic symbol) or from your graveyard for its mayhem cost by paying ({3} magic symbol) ({B} magic symbol) , targeting any applicable target.
Holding priority, cast
Dualcaster Mage by paying its mana cost.
When
Dualcaster Mage enters, it triggers, targeting
Prison Break.
Holding priority, activate
Altar of Dementia by sacrificing
Dualcaster Mage.
Resolve the
Dualcaster Mage trigger, copying
Prison Break, with the copy targeting
Dualcaster Mage.
Resolve the
Prison Break copy, returning
Dualcaster Mage from your graveyard to the battlefield.