vic20
Fool
My own thought was that the power was easier to write as an at will that had a restriction on how many times a day it could be used.
That said, it is easier to conceptualize (at least for me) as a power that grants a number of daily powers. If I ever play a palladin, I will create one power card for each use, using the same backer for them as I would for my daily powers.
One confusion that could result would be that you couldn't use Salve of Power to "recharge" a usage, which you might be inclined to think were possible looking at your power cards.
"When salve of power is applied to a creature, the target can expend one healing surge to regain the use of one daily power of 5th level or lower (instead of regaining hit points). "