It seems like a translation error to me. If I understand the Spanish card correctly, it says "inflicts damage to all invocations less than 4 attack". While in reality, the effect should be "inflicts damage to all invocations that have at least 4 attack".
Could you confirm this to me? If it's the case, then it's a translation issue and we'll correct it quickly. 
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Ankama Trackers
unyielding guardian doesn't works
By Minaw#6883 July 11, 2017, 02:58:26
AnkaTracker
First Ankama intervention
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It seems like a translation error to me. If I understand the Spanish card correctly, it says "inflicts damage to all invocations less than 4 attack". While in reality, the effect should be "inflicts damage to all invocations that have at least 4 attack".
Could you confirm this to me? If it's the case, then it's a translation issue and we'll correct it quickly.
i tested with a friend and you have reason the card have a mistake of translation the minions has to have more than 4 AT to inflict damage . in spanish should say something like this "inflige 2 de daño a las invocaciones enemigas que tengan mas de 4 AT"
Alright, I'll see if this can be changed quickly. Thank you for your help!
another cards have the same problem, how i can help? i post cards here or i need create another post?