When two yellow Leonas attack Deadbloom (which has deflect), do you pay deflect twice for each Leona stun, or only once since you cannot stun the same target twice?

Ruling: You must pay deflect twice. Both Leona effects trigger simultaneously and must each target a unit when put on the chain, which is when deflect costs are paid. Even though a unit can't be stunned twice, it can still be selected as a target for stunning effects. The first stun resolves normally, and the second stun resolves but does nothing since the unit is already stunned.

Sequence:

• Both Leona effects trigger at the same time
• Both must select Deadbloom as target and pay deflect when putting effects on the chain
• First Leona effect resolves, stunning Deadbloom and triggering Leona Legend
• Second Leona effect resolves, doing nothing since Deadbloom is already stunned

Nuances:

• Even when there is only one legal target, you are still "choosing" and "targeting" that unit according to the FAQ
• A stunned unit can be a valid target for additional stun effects, even though the effect does nothing
• You only get one Leona Legend buff because only one stun counter was actually added
• If you cannot pay the deflect cost, the effect cannot be put on the chain
• Note: This ruling was later changed in a rules update where triggered abilities that incur a cost when put on the chain may now be refused