Sorry for the really late reply, but this seems like something that many people would want to do so here goes...
How about a buff that runs a periodic effect very often and have the effect drain X energy and add Y shield/health and put a validator on the effect so it only activates if the unit has energy and doesn't have full health? Kind of a super quick heal instead of an actual shield. The only problem i can think of is that if the unit takes more damage than it's health, it would die even though the shield might have saved it.
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Sorry for the really late reply, but this seems like something that many people would want to do so here goes... How about a buff that runs a periodic effect very often and have the effect drain X energy and add Y shield/health and put a validator on the effect so it only activates if the unit has energy and doesn't have full health? Kind of a super quick heal instead of an actual shield. The only problem i can think of is that if the unit takes more damage than it's health, it would die even though the shield might have saved it.