Does Spirit Wheel trigger when playing The Syren, since Syren doesn't explicitly say 'choose'?

Ruling: Yes, Spirit Wheel triggers when playing The Syren. Spells and abilities don't need to explicitly say "choose" to fall under the "choose" category - if they require you to select a target (like Syren requiring you to choose a friendly unit), they count as choosing.

Nuances:

• This interaction also works with Irelia's Fervent ability and her Legend ability
• This does NOT work with Graceful, as Graceful is spell-specific only