Personally, I think that if Purify can exist and be seen in some t50 decks, a simple 1Fire spell called Thaw that removed the frozen condition from all creatures on your side of the field is perfectly comprehensible. I also firmly believe that a spell that removed the 'infected' status from all of your creatures (should be Light) is a good idea, and also a spell that healed all of your creatures by 5 HP (should be Life).
That said, I can also see how Purify affects the player, and the other spells would all affect creatures, which at the moment are pretty much up s*** creek when hit by pretty much any status effect.