[fixed/closed]Corpseweft ability costs 1R

[Aswan jaguar]

Describe the Bug:
At first I thought just that AI was bugged and couldn't play Corpseweft but in fact it didn't have to activate it.Ability costs .

Which card did behave improperly ?
Corpseweft

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
Manalink 2015/12/25: Battle For Zendikar,duel

What exactly should be the correct behavior/interaction ?
Corpseweft ability costs .

Are any other cards possibly affected by this bug ?
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[Korath]

Fixed 7906fa7.