If I use Thwonk with Repeat twice on the same unit, does Leona's legend ability trigger once or twice?

Ruling: Leona's legend ability triggers twice. Even though Repeat resolves as a single spell effect, the two stun actions are separate game actions that cannot occur simultaneously, so each triggers Leona independently.

Sequence:

• The first stun action stuns the target unit and triggers Leona's ability
• The second stun action is performed as a separate game action (even though the unit is already stunned) and triggers Leona's ability again

Nuances:

• Game actions cannot be performed simultaneously, so even effects from a single repeated spell must resolve as sequential separate actions
• This applies whether you target the same unit twice or two different units - either way, Leona triggers twice
• The key is that each stun is a distinct game action, not whether the stun successfully changes the unit's state