I hope you don't mind me listing the deck I used to get this achievement legitimately. I used only 4 premium cards, but I'll list alternatives that can easily replace them. Overall it took me 67 hours to complete the game legitimately (no boosting), and this was obviously the last achievement I needed. I tried many decks, but this one worked best for me. It has an answer for pretty much everything you will encounter online. I estimate a 75-80% win-rate. Please remember to play "Player" matches only; ranked will not count.
This is my own version of the 'Natural Order' deck you can get from the tutorial. I'll list the cards and then how to play it below:Deck List:
2 Arbor Colossus
4 Necromancer's Assistant
3 Nemesis of Mortals
2 Pelakka Wurm
2 Reclamation Sage
2 Rune-Scarred Demon
4 Satyr Wayfinder
1 Shadowborn Demon
3 Rescue from the Underworld
4 Dead Reckoning (the only premiums! Replace with Elvish Visionary if you don't buy premiums)
3 Spider Spawning
4 Golgari Guildgate
9 SwampHow to play:
In your starting hand you'll need at least 1 Satyr Wayfinder (preferred) or Necromancer's Assistant to get some goodies in your graveyard early. Ideally you'll have a Golgari Guildgate another 2 lands in your opening hand.
Turn 1-2: Play your lands and hopefully on turn 2 you can play a Satyr Wayfinder
Turn 3: Play Necromancer's Assistant, or if the board looks manageable, you can play a Cultivate. Don't be afraid to block with your creatures even if they might die. A large graveyard is a happy graveyard, especially if it send your opponent's creatures to the grave, too. Just keep in mind you might need one creature out for Rescue from the Underworld.
Turn 4-5: You should be able to get a large creature out in one of several ways. Either you played a cultivate previously and can drop an Arbor Colossus/(reduced cost) Nemesis of Mortals/Shadowborn Demon or use Rescue from the Underworld to grab a fatty from your graveyard.
Turn 6+: Just keep pounding your opponent with your big creatures. Likely at this point he or she will be forced in to a defensive strategy. If your opponent has decent removal you should be able to cast a Spider Spawning to overwhelm your opponent with tokens. To keep your deck from running out of steam (rarely happens) you can use Rune-Scarred Demon to find a specific card you need (I usually go for Rescue from the Underworld) or use Griselbrand to draw more cards (if you have enough life). Notes on specific cards:Rescue from the Underworld
is an instant, and the creatures will not come back from the graveyard until the start of your next turn. You can save this to play during your opponents turn. I like to do one of three things: a) Use it on a blocking creature to save yourself some damage. b) Use it to sacrifice a creature that would have otherwise been removed by your opponent's spell or c) just use it at the end of your opponent's turn to avoid any surprises.Monstrosity (Arbor Colossus and Nemesis of Mortals)
can be used at any time (like an instant). I like to attack with my creatures first, see how my opponent is blocking, and then decide if I want them to go monstrous or not. If they're going to block it with a smaller creature, you might just want to save your mana for another spell. Alternatively, you can make a creature go monstrous at the end of your opponent's turn, before your start your own turn.
I will usually use Rune-Scarred Demon
to get a Rescue from the Underworld, unless another card is needed. Rescue from the Underworld is such an excellent card to have in your hand as a safety net. Plus you can use it to sacrifice the Rune-Scarred Demon you just played and search out another card you might need.
Have you got Shadowborn Demon
out with fewer than 6 creatures in your graveyard? A fun creature to sacrifice is Bloodghast
! Likely he'll come right back that turn anyways when you play a land. ^_^
If you have any other questions regarding the deck, please let me know in the comments below. Good luck!