MArcomage

Nullify (N): nullify up to N damage your opponent dealt you last turn.
e.g.: your opponent dealt 7 damage to your wall and 5 to your tower, then you use a nullify(10) card so you get wall+7 and tower+3.
First question: is it implementable?
Secon question: do you like the idea? (I do)

isnt there a card that already negates the effect of ur enemy either on ur structures/stock or his?

i think it's a rare mage card

yes, it's master of the past. but I'm not suggesting a new card, I'm suggesting a new keyword, similar to charge(N).

oh ok

It is implementable.

maybe make it so that it can recover only wall? to make it more strategic

Or only tower, since most damage is soaked by wall.
Though this wouldn't make direct damage deck players happy...

maybe both, if tower<wall => recover wall
if wall<tower => recover tower

that will make it even more interesting

I like it, but I say we go with the "appropriate damage"-system. First nullify dmg on wall, if there's any nullify left, tower second. i.e.

15dmg, 10 nullify. If 5 wall before atk, u regain 5 tower (and wall). If 10 wall before, regain 10 wall.