If you defend with Teemo, Strategist while having Rabadon's Deathcrown equipped and reveal 0 cards with Hidden, will Teemo create a 'Deal 0' damage trigger that can be impacted by Rabadon's Bonus Damage?

Ruling: No. Teemo does not create a damage event if 0 cards with Hidden are revealed. You cannot deal 0 damage - 0 damage is not a valid damage event.

Nuances:

• "Deal 1 for each card revealed this way" is a single deal action, not multiple separate damage instances
• The effect counts cards with Hidden and deals that much damage; if there are no Hidden cards revealed, no deal action is performed
• The rules specify that only non-zero damage is valid damage (found in the splitting rules section)
• With Rabadon's Deathcrown, Teemo's possible damage range is 0, 4, 5, 6, 7, 8 (where 0 means no damage event occurs)