Does 4 drop yellow Leona trigger Deflect when she attacks?

Ruling: Yes, 4 drop yellow Leona triggers Deflect on attack, but you can decline to pay the cost.

Nuances:

• If you decline to pay the cost, the Deflect ability will not go on the chain
• You might decline if there's only one unit (like a Pouty Poro) that you don't want to target