Playing a green card ends the turn so do I attack the turn I play the Venemous Creeps, or the following turn?
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From the Venemous Creeps section of the Chaos Marauders card reference:
So the normal rules apply, that is to say: "As soon as a battle line has been completed, it can attack any opponent’s incomplete battle line" [assuming the completed battle line is strong enough].
Therefore, yes, you do attack on the current turn, not the next turn.