Does Bandle Tree allow hiding two cards at one battlefield by paying once, or does it add an additional hidden card slot (allowing two total cards hidden by paying for each separately)?

Ruling: Bandle Tree adds one additional hidden card slot to the battlefield, allowing up to two cards to be hidden there total. You must pay the hiding cost for each card separately.

Sequence:

• Pay the cost to hide the first card at the battlefield
• Pay the cost to hide the second card at the same battlefield (only possible with Bandle Tree)

Nuances:

• On any battlefield without Bandle Tree, there is a cap of only one hidden card
• Attempting to hide a second card at a non-Bandle Tree battlefield would be an illegal action