In a multiplayer game, if Player A controls a Battlefield and Player B moves their unit to start a showdown, can Player C use movement cards like Ride The Wind or Zenith's Blade to move their unit to that Showdown?

Ruling: Player C can cast the movement spell when priority passes to them, but the spell will fail to move the unit because a battlefield cannot have units from more than 2 players at it at any point.

Sequence:

• Player B moves their unit to start a showdown at Player A's battlefield
• Priority passes around the table, including to Player C
• Player C can cast movement spells like Ride The Wind
• The movement effect fails because the battlefield already has units from 2 players

Nuances:

• Priority still goes around the table to all players during a showdown, even if they cannot successfully move units to that battlefield