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Describe the Bug:
Ensnare in this game most times does not work for it's alternative cost (returning 2 islands to hand) you select the alternative cost to pay select the 2 islands the islands return to hand and then most times it rejects Esnare back to hand (it doesn't make it to stack) and no effect = tapping all creatures happens of course.(normal cost works fine)

Scenario: AI casts with dash Kolaghan, the Storm's Fury in response I try to cast Esnare by returning the 2 islands to hand

Also something that seems relevant is that probably each time it gets rejected AI taps for mana in my tests,all available mana as soon as I select/return the lands in hand.

NOTE 1: I tested in a clean game and it worked fine both for alternative and normal cost and I tried testing all possible play or bug scenarios I could think off not tested with dash mechanism or Kolaghan, The Storm's Fury though.
NOTE 2: If in the above scenario I play Ensnare before AI casts with dash Kolaghan, the Storm's Fury it works fine so probably either Kolaghan, the Storm's Fury or dash mechanism have a bug.

Which card did behave improperly ?
Kolaghan, the Storm's Fury ? or dash mechanism? or Ensnare?

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
Manalink 2015/3/25: Fate Reforged,duel

What exactly should be the correct behavior/interaction ?
Ensnare
Kolaghan, the Storm's Fury
Are any other cards possibly affected by this bug ?
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The save game works fine for me.

AI cast Kolaghan, The Storm's Fury and after it hit the table you cast Ensnare returned 2 islands back and it worked correctly?

Ah, when you said in response I thought you meant before it hit the table (in which case it worked fine). Once it hits the table then it doesn't work. Confirmed.

Yup, "Dash" was bugged, it's already fixed in dev.