Can a Champion Unit move from the Champion Zone to a battlefield, and how does it work?

Ruling: Champion Units start in the Champion Zone, which functions like an extension of your hand - they cannot use abilities from there and must be played first. When you play a Champion Unit (like Ahri), you pay its summoning cost and it enters exhausted in either your base or a battlefield you already control, exactly as if playing from hand.

Sequence:

• Pay the Champion Unit's summoning cost (including any rune recycling requirements)
• Place the Champion Unit exhausted in your base OR a battlefield you control
• The Champion Unit follows all normal unit rules once in play

Nuances:

• The Champion Zone is like having the card revealed in your hand - units there can only be played, not used for abilities
• If your Champion dies, it goes to trash like any other card and can be recycled
• If you draw additional copies of your Champion from your deck, they stay hidden in your hand
• Any unit (not just Champions) can be played directly to a battlefield you control, not just to your base
• Exhausted units can still defend when a battlefield is attacked