Concentration healing spell possible?

[Slitherin]

How would I make a concentration spell (like siphon mana or life drain) that just has one unit heal another as long as he sits there casting that spell(not healing himself or draining hp from the other char)

 

[Grundy]

one way is to use Channel and make it give the target unit a certain buff (called Channel Heal in this trigger) while the ability is being channeled

then you use this trigger:

Channel Heal
    Events
        Time - Every 1.00 seconds of game time
    Conditions
    Actions
        Unit Group - Pick every unit in (Units in (Playable map area) matching (((Matching unit) has buff Channel Heal) Equal to True)) and do (Actions)
            Loop - Actions
                Unit - Set life of (Picked unit) to ((Life of (Picked unit)) + 50.00)

theres probably a better way to do it but i've been messin with this stuff all day my brain needs a break