In Duels of the Planeswalkers 2012 , the land count is automatically adjusted to 40% of the total deck size
The power level in my homemade cube is absolutely lower than unpowered cubes, there is plenty of (non-combo) graveyard synergy, and yet a one mana Looter cannot get play time
I've even found some pricing on cases of sealed product for those looking to rip open a tonne of boosters, so get on it before the market value on these products shoot up
You are never forced to activate mana abilities to pay costs, so if there is a mandatory additional mana cost (such as from Thalia, Guardian of Thraben), you can decline to activate mana abilities to pay for it and hence fail to cast the suspended card, leaving it in exile
Each colour of mana has strengths and weaknesses so understanding the game play of each colour is vital
There was also a recently announced version of this card that could potentially be worth thousands of dollars