How does Here to Help interact with units that have 'You may choose to play me to an open battlefield' text?

Ruling: When playing a unit through Here to Help, you must follow Here to Help's restriction to play the unit to a battlefield you control. The unit's ability to be played to an open battlefield does not override this restriction.

Sequence:

• Here to Help is played, targeting a battlefield you control
• When resolving, you may choose a unit from your hand to play
• The unit must be played to the battlefield you control (Here to Help's restriction)
• The unit's "play to open battlefield" ability is forfeited

Nuances:

• "A battlefield you control" is treated as a targeting restriction that must be followed
• Here to Help does not need to reference the specific card until resolution
• If a unit cannot legally be played to a battlefield you control (like Perched Grimwyrm which can only be played to an open battlefield), it is not a legal choice and you must either pick a legal unit or choose not to play anything