Chthonian Nightmare enters the battlefield, it triggers, causing you to get ({E} magic symbol) ({E} magic symbol) ({E} magic symbol) .
Activate
Chthonian Nightmare by paying ({E} magic symbol) ({E} magic symbol) ({E} magic symbol) ({E} magic symbol) , sacrificing a creature with mana value 2 or less, and returning
Chthonian Nightmare from the battlefield to your hand, returning
Archaeomancer from your graveyard to the battlefield.
When
Archaeomancer enters the battlefield, it triggers, returning
Capture of Jingzhou from your graveyard to your hand.