Can you flip Teemo Strategist to buff Ember Monk when there is no enemy target for Teemo's ability?

Ruling: You can flip a card without a valid target. Teemo will flip and Ember Monk will receive the buff, but Teemo's ability will not trigger at all.

Nuances:

• If a target exists when the "when I defend" ability enters the chain, you must reveal the top 5 cards even if the target is removed before resolution
• If the target is removed before damage resolution (e.g., by Gust), you still reveal but deal no damage
• The same applies if Teemo is removed before resolution
• Reveals still happen for the sake of other card interactions (e.g., Nocturne) as long as a target existed when the ability triggered