For land destruction, you do not want to use them until Avacyn is safely on the battlefield
Necromantic Selection, on the other hand, allows you to reanimate the best creature that just died
The Rollover Cards An honorary Eldrazi, Ugin, the Spirit Dragon is one of the best end game options and the best card to ramp to in recent times
Not to mention it can keep coming back after your opponent kills it, making it even harder to really kill off
Even When They Don't Work It's Really Hard to Get Mana-Screwed Ha Ha, Dead Red Bant Has the Best Answer to Everyone Bant is Better Than Sultai In Winner-Take-All Magic , You Need to be Lucky Did You Like Azorius
*Each box contains a random selection of three different pack designs