Holding priority, cast Double Major by paying ({G} magic symbol) ({U} magic symbol) , targeting the Biovisionary spell.
Riku's first ability triggers, causing you to pay ({U} magic symbol) ({R} magic symbol) to copy Double Major, targeting the Biovisionary spell.
Resolve both Double Majors, copying the Biovisionary spell twice.
Resolve all Biovisionary spells.
The nontoken Biovisionary enters the battlefield, triggering Riku's second ability, causing you to pay ({G} magic symbol) ({U} magic symbol) to create a token copy of Biovisionary.
At the beginning of your end step, each Biovisionary triggers.
Resolve the first Biovisionary trigger, causing you to win the game.