SC2 has a special difficulty algorithm that allows for vast decreases in difficulty per 360 blocks (~200%) but only small increases (~14%). It seems that this could be exploited by using a script that does the following:
1.) Mines SC2 when ((number of blocks / 360) % 2 == 0), that is, every other difficulty difficulty adjustment period.
2.) Mines BTC when ((number of blocks / 360) % 2 != 0). This would allow you to use your cards for BTC in the meantime.
If a large number of people use such a script, for example 90% of the miners, the difficulty will quickly drop to what it would be if only 10% of the network were mining. This would maximize return per watt for people mining SC2, yielding bitcoin when they aren't mining SC2.
This is an old an very well known attack. Using it this way is an interesting way to compensate for the 5 SC reward per block but it will still take a very long time to get the million SC you need to free the network from coinhunter's talons. Even if you do manage that you are still using a blockchain with a tax.
Give up on SolidCoin, it's too compromised to even be worth abusing.