This is a relatively easy combo to pull off for elf decks. You could use wirewood channeler(tap add X mana of any color where X is the number of elves in play) to ply intruder alarm(creatures don't untap during their controller's untap phases, whenever a creature comes into play untap all creatures), and then use voice of the woods( tap five untapped elves you control and put a 7/7 trample elemental token into play) Now, you use five elves to make an elemental token, and then everything untaps, make another elemental token, and untap, etc. etc. and then unless you're opponent plays wrath of god or kirtars wrath, or some other mass removal spell, you pretty much win.