Can Janna be played on a battlefield you do not control to bounce an attacker?

On my turn I conquer a battlefield with one unit, then Charm an enemy unit from another battlefield onto mine. The opponent responds with Janna to move my unit away.

Can they play Janna on the other battlefield to move my unit?

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•Riftbound France Discord — Rulings forum

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Can Janna be played on a battlefield you do not control to bounce an attacker?

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