Nemesis Trap says "Exile target attacking creature. Put a token that's a copy of that creature onto the battlefield. Exile it at the beginning of the next end step." So is the next end step the same turn i play it (assuming i play it during attack phase)? Or is it like "i'll see you next weekend" which we all know and understand is not the weekend at the end of this week but at the end of next week!? If i have to exile the token the same turn i put it out, all its good for is blocking another attacking creature?

Also, a question on cards like Serpent of the Endless Seas and Claws of Valakut that refer to the number of Islands or Mountains you control. Is this just basic lands? Do they have to say the word Island, or Mountain? Would Madblind Mountain count? etc...