In most cases, Heroic Intervention is the defacto protection spell that you want to use
Since blue is popular and blue decks usually have at least a few artifacts, Mogg Salvage is definitely low on the opportunity cost scale
This is one of the most interesting spells to me, as most often it will be best to play the two halves of the card on different turns
If Permeating Mass becomes a copy of another creature before its triggered ability resolves, the damaged creature will become a copy of that creature
Loxodon Warhammer (SLD foil $10) Adding three power is the magic number for both of them, and while a classic, you especially want trample on Tifa
Lorwyn had a huge focus on creature types, and it impacted creature type lines in both the past and the future