Can Teemo from the champion zone be played as hidden directly?

Ruling: No, cards from the champion zone cannot be played as hidden (though this may change in a future rules update).

Nuances:

• The rules contain contradictory statements about whether Hidden requires the card to be in hand
• One rule states "The Hidden keyword allows a player to pay a cost to Hide a card any time they have a Hidden card in their hand"
• Another rule states "Hide is not a subset of Play"
• The design team acknowledged the contradiction and indicated they will clarify the rule, potentially allowing hiding from the champion zone in the future
• The restriction makes sense from a design perspective since it moves a card from a public zone to a private zone