There was supposed to be a sketch of this card, but I'm too lazy
It just idea, which I came up with in 2 minutes.
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Garrison Merics
Enchantment
Grants a healing equal to 6 standard healing +7% of the unit's max health per second
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Thus, units with more HP(like a Speartons or Juggerknights) will heal significantly faster than without this enchantment. The same goes for a unit with a small amount of HP(like a Deads, Wraths, Archi/Eclips etc), only to a lesser extent