To play Facebreaker, does there have to be both a friendly unit and an enemy unit? Does the 'do as much as you can' rule apply?

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You must choose both a friendly unit and an enemy unit at the same battlefield when you put Facebreaker on the chain. There must be at least one battlefield that contains both a friendly and an enemy unit to make those choices; you cannot play it just to stun one unit. The “do as much as you can” idea does not let you play it targeting only one side. If the chosen targets later change zones off the board the targeting relationship is severed; if they merely stop meeting the battlefield requirement but remain on the board, they remain chosen per the targeting rules.

To play Facebreaker you must be able to choose a friendly unit and an enemy unit that are both at the same battlefield as you finalize the spell on the chain. If no such pair exists, you cannot play it. The spell does not get to partially resolve by only stunning one unit at play time. If the chosen targets are later moved to a non-board zone the targeting relationship is broken; if they remain on the board but no longer meet the original battlefield restriction they are still considered chosen by the spell while it’s on the chain.

Determine whether there is at least one battlefield that currently contains both a friendly unit and an enemy unit. If such a battlefield exists, choose a friendly unit and an enemy unit at that same battlefield as the targets for Facebreaker when you finalize the spell on the chain [355.5] [355.8]. Because you are choosing specific units, those choices are targets and must meet the targeting restrictions (friendly/enemy and same battlefield) to be valid [355.7] [355.9]. If you cannot make those two valid choices when putting the spell on the chain, you cannot play Facebreaker. If the spell is played from Hidden, it must be played to that battlefield and its targets chosen from among options at that battlefield [811.1.d.1] [811.1.d.2]. If the chosen targets later move to a non-board zone the targeting relationship is severed; if they remain on the board but no longer meet the battlefield restriction they are still the chosen targets while the spell is on the chain [FAQ:unleashed#22].

Playing from Hidden: If you play Facebreaker from Hidden, you must play it to the battlefield where it is facedown and choose targets from that battlefield when finalizing the play [811.1.d.1] [811.1.d.2]. 2v2/team games: 'Friendly' can include your teammate’s units per teammate rules, so a battlefield containing a teammate’s unit and an opponent’s unit can be a valid place to choose targets [484.8.d]. Targets becoming illegal between finalization and resolution: If targets remain on the board but stop meeting the 'same battlefield' restriction, they remain chosen by the spell while it’s on the chain; you may be able to use 355.11.b to pick a legal subset at resolution only if such a subset still satisfies the spell’s group requirement, which for a 'friendly and an enemy unit at the same battlefield' usually means no useful subset exists. Targets moved to a non-board zone after being chosen: The targeting relationship is severed and the spell cannot affect those objects (they are no longer the same game objects) [FAQ:unleashed#22].

The text of Facebreaker instructs you to 'Stun a friendly unit and an enemy unit at the same battlefield.' Because that wording requires you to choose specific game objects (a friendly unit and an enemy unit), that choice is made when the spell is put on the chain [355.5]. Choosing specific objects in the card’s text makes them targets [355.7], and you must make valid choices for all targets in order to put the spell on the chain [355.8]. A target is only valid if it meets the targeting restrictions in the card’s text (here: friendly/enemy and both at the same battlefield) [355.9]. Therefore, to play Facebreaker there must exist at least one battlefield that contains both a friendly unit and an enemy unit so you can choose one of each as targets. If no such pair exists, you cannot legally play the spell because you cannot make the required valid choices [355.8] [355.9]. The general 'do as much as you can' idea does not let you play the spell targeting only one side: the spell requires both choices to be made as it is finalized on the chain, so it’s not legal to put it on the chain choosing only a single target [355.5] [355.8]. If Facebreaker is played from Hidden, the Hidden rules add that the card must be played to that battlefield and any targets chosen by the play effect must be chosen from among the options at that battlefield [811.1.d.1] [811.1.d.2]. For resolution timing nuance: once you have chosen targets and the spell is on the chain, the targeting relationship persists as long as the chosen objects remain on the board even if they no longer fulfill the original targeting restriction; that means moving a chosen unit somewhere else on the board won’t necessarily break the targeting relationship [FAQ:unleashed#22]. The exception is if a chosen unit changes to a non-board zone (for example, moved to a hand, deck, or trash); in that case the game object is no longer the same and the relationship is severed [FAQ:unleashed#22]. Lastly, 355.11.b allows a spell’s controller to choose a subset of originally chosen targets at resolution if the original group no longer collectively meets the targeting requirement; in practice for Facebreaker there is rarely a useful subset because the requirement explicitly needs both a friendly and an enemy unit at the same battlefield, so if that collective requirement cannot be restored at resolution the spell will have no legal group to affect [355.11.a] [355.11.b].