Cast Ghostly Flicker by paying ({2} magic symbol) ({U} magic symbol) , blinking Omnath and Mystic Sanctuary.
Omnath and Mystic Sanctuary enter the battlefield, triggering Mystic Sanctuary, Omnath's first ability and Omnath's second ability twice.
Resolve the Mystic Sanctuary trigger, putting Ghostly Flicker on top of your library from your graveyard.
Resolve all Omnath triggers, causing you to draw a card, gain four life and add ({R} magic symbol) ({G} magic symbol) ({W} magic symbol) ({U} magic symbol) .