Collectible Card Game Headquarters

Describe the Bug:
Sylvok Explorer can produce colourless mana while opponent has no land on the battlefield.

Which card did behave improperly ?
Sylvok Explorer

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
2014/05/06: Journey into Nyx

What exactly should be the correct behavior/interaction ?
Sylvok Explorer produces mana of any colour that an opponent land produces,no lands-no mana.
From the wording I understand that it can produce only coloured mana anyway so even If opponent had an Academy Ruins in play still Sylvok Explorer can't produce any mana since colourless isn't a colour.

Are any other cards possibly affected by this bug ?
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When I click on it in your save (and a clean game) nothing happens if opponent has no lands.

I noticed that what you say happens BUT happens only if you click to get mana in advance.Select a spell to cast/activate and click on it then and it will give you 1 colourless mana besides it is highlighted as ready to be activated (but it shouldn't)as opponent has no lands.

Fixed in 49564e5.
This also fixes Fellwar Stone and Exotic Orchard, which all share the same code.

When opp controls no land:
1) Sylvok Explorer is highlighted as activatable even when it shouldn't be
2) when a spell is cast it can be used for 1 colorless mana

EDIT (12/4/2014): per ruling for Fellwar Stone, Sylvok Explorer should be activatable even when opponent controls no land, it just won't give you any mana.

All fixed in bf8e4a6