Deal 1,000,000 damage achievement.

Ever wanted to complete the 'deal one million damage' achievement? What if I told you it could be done in one game? The following is probably the most efficient way to get this achievement. What I have here to offer is more of a strategy than a set-in-stone deck; It can be adjusted based upon your budget needs. Let's talk about what is absolutely necessary for the strategy to function

1: 1 copy of Talir's Unwinding
This card is absolutely pivotal to the deck's success. It shuffles both players' decks, allowing the game to continue for a much longer time (and it's going to be a very long game). Its "your opponent draws 7 cards" clause makes it seem so useless, but that is exactly why It's good here. More on that later.

2: 1: Access to the Azindel boss fight at the end of the Vara campaign.
Starting with a high power count makes this much less tedious than if you were to try to get the achievement vs. say, a gauntlet opponent. You will actually need to have the into shadow campaign anyways in order to use the card:

3: Messenger Hawk
Since Talir's Unwinding has voidbound, we will need a way to put more copies into our deck in order to play infinitely.

4: A set of merchants that can fetch your Talir's unwinding.
Since Azindel has ways to discard the top of your deck, it is safer to put Talir's Unwinding in the market. My only advice is to avoid Auralian Merchant because it has no attack, and you will need to have units that can attack to get the achievement.

5: At least one copy of Martyr's Chains This card allows us to get our units to 999/999. More copies is always preferrable, as it allows you to set up your damage engine faster, but once you get going, having more doesn't affect it at all. Remember that you can get a copy of chains in one of the theme decks for 2500 gold if you don't have one.

6: At least one copy of Scourge of Frosthome
this is important because it prevents Azindel from interacting with our units or relics, and ensures that he will do nothing but put units on the board.

7: tutors, cards that let you search your deck for other cards.
The most important one is Display of Knowledge. This lets you grab chains from your deck, and later in the game it lets you swing into deadly units, and use it as a fast spell to give your unit quickdraw-- keeping it alive. Celestial Omen and Rise to the Challenge are also great.

8: a few non-evasive bodies to fill out your board. Prefferably cantripping ones like Temple Scribe and Heart of the Vault because they make it easier to get your set up early. It's important that these units can be blocked by opponent's so you don't win the game. Putting at least one lifesteal unit in your deck can be important so you don't die to nightfall.

9: more cards to fill out your deck so you have 75 cards. I like Frost Talisman because it stabilizes early and you can use your 50 power to dig through a lot of your deck. Card draw in general is nice.
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The Strategy
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Before you begin, check the achievements page. See how much damage you need to do to get the achievement and divide that number by 999. Remember the number.

Mulligan for a hand with a good number of combo pieces/card draw. Azindel will go first, so remember that you can use your cards like Display and Celestial Omen on his turn.

Put a Scourge into play as quickly as possible. You really don't want azindel breaking your chains because you will have to use Talir's Unwinding to get them back.

Build up your board to stop his attacks. During this time, get as many chains into play as possible. Remember that if you only have one Chains, you can use a hawk to put more into your deck. Remember also not to play power once you have chains down unless you need to do so to stay alive.

Once you have some 999/999 units on board, you can start attacking. Remember not to attack with more units than he has blockers, or else you will win.

Use Messenger Hawk to make copies of Talir's Unwinding, and then play it. This will give your opponent 7 more cards on his turn so he can build out his board. This will allow you to attack again. Count the number of times one of your unit attacks so that you don't play for too long or not long enough.

use hawk on talir's unwinding enough that there are a lot of talir's unwindings in your deck, but not every single card. You want to be able to cast this almost every turn. Once you have a comfortable number, use hawk only every 4 times you reshuffle.

Attack the sufficient number of times, and then kill azindel. You have gotten the achievement!