Can you move two units from different locations to attack the same battlefield in a single action?

Question

Accepted Answer

Yes. You may declare multiple units' Standard Move simultaneously to the same battlefield even if those units start in different locations, provided the move is legal for each unit and performed during your Main Phase (not during a Showdown/Combat). See rules on multiple standard moves and destination restrictions.

You can move two (or more) units from different origins to the same battlefield in one simultaneous Standard Move. When you declare multiple units’ Standard Move, their Destination must be the same and their Origins may differ; exhaust each unit to pay the cost and obey destination restrictions (e.g., you cannot move to a battlefield that already has units from two other players or an ongoing Combat with two other players). [144.3] [144.3.a] [144.3.b] [144.3.c] [144.2] [144.4.a.1] [144.1.a] [144.1.c]

Confirm you are in your Main Phase and not in a Showdown or Combat. [144.1.a] [144.1.c] Declare that you are performing multiple Units' Standard Move simultaneously. [144.3] Choose the Destination battlefield; that Destination must be the same for all units you are moving. [144.3.a] Confirm each unit’s Origin is legal for a Standard Move (Base→Battlefield or Battlefield→Base unless the unit has Ganking). [144.4.a] [144.4.b] [810.1.b] Exhaust each unit as the cost for the move; those exhaustion costs are paid simultaneously. [144.2] [144.3.c] Ensure the destination is allowed (not a battlefield with units from two other players or an ongoing Combat with two other players). If it isn’t allowed, you cannot move there. [144.4.a.1]

You cannot perform the simultaneous move during a Showdown or during Combat; moves must be in an Open Main Phase. [144.1.c] [144.1.a] If a unit’s only legal Standard Move option would be to a battlefield that is illegal due to the 'two other players' restriction, you cannot include that unit in the simultaneous move to that destination. [144.4.a.1] If a unit is using Ganking to move from Battlefield→Battlefield, that is allowed as part of the simultaneous declaration because Ganking grants that Standard Move option; multiple Origins still may differ. [810.1.b] [144.3.b]

The Core Rules explicitly allow performing multiple units’ Standard Move simultaneously: "Players may perform multiple Units' standard move simultaneously." [144.3]. When you do so the units’ Destination must all be the same [144.3.a], but their Origins ‘‘do not need to be the same’’ [144.3.b]. Paying the cost of a Standard Move requires exhausting the unit, and when moving multiple units those exhaustion costs are paid simultaneously [144.2] [144.3.c]. Standard Moves can only be done during a player's Main Phase and cannot be done during a Showdown or Combat [144.1.a] [144.1.c]. Destination restrictions still apply: units may move from Base to a Battlefield or from a Battlefield to Base [144.4.a] [144.4.b], and you may not move to a Battlefield that already has units from two other players or where a Combat is ongoing with two other players [144.4.a.1]. Additionally, units with Ganking can move from Battlefield to Battlefield as part of their Standard Move option [810.1.b]. Putting this together: you may move two units from different locations to the same battlefield in one simultaneous Standard Move as long as you are in your Main Phase, you exhaust each unit to pay the cost, each unit has a legal Standard Move to that destination, and the destination satisfies the battlefield restrictions. If you intended a different meaning of “attack” (for example a special ability that creates an immediate attack outside the Standard Move rules), that would require inspecting that specific ability’s text; the ruling above interprets "attack" as performing a Standard Move to a battlefield so they may later participate in combat.