Hi i have a combo i would like to share, it needs old cards (witch are some of the best) but can really get on your oppents nerve:
Cast animate land on lets say your opponents forest (it works for any land) it makes it a 3/3 creature but is still a land, he might think your crazy but then you cast:
Eradicate, eradicate says : destroy target creature then look through your opponents grave yard, hand and library and discard all cards of that creatures type from the game, well that would be his forest, so you remove all his forest from the game cause that was the creature type. You can pull this off by second turn with dark ritual.
Hope this helps :).
If you want to chat about magic drop me a line at Conor_supersaiyan@hotmail.com.