When you use Charm to move an enemy unit to your battlefield to initiate a showdown, who gets focus and priority first?

Ruling: The attacker (your opponent) always has focus first, even though you used Charm to initiate the showdown. The game considers your opponent's unit (and therefore your opponent) as the one who initiated the showdown.

Nuances:

• Even though you played the spell that caused the showdown, the game mechanics treat the opponent as the initiator because it's their unit that is attacking.