Activate Will Kenrith's -2 ability targeting yourself, reducing the cost of your instant, sorcery, and planeswalker spells by ({2} magic symbol) until end of turn and drawing you 2 cards.
Activate Mana Geode by tapping it, adding ({U} magic symbol) .
Cast Ghostly Flicker by paying ({U} magic symbol) , targeting Mana Geode and Shipwreck Dowser, blinking them.
When Shipwreck Dowser enters the battlefield, return Ghostly Flicker to you hand.