Keep in mind that the swords are all colorless, which makes it very unlikely that we will see enchantment destruction. In fact, I have doubts that we will even see artifact destruction since normally black and blue can't do that. Oddly enough, land destruction is more likely when you consider the color pie (ark of blight, wasteland). Of course, putting repeatable land destruction on an equipment that already gives some blocking evasion and protection from removal would be a huge design taboo. It would be pretty awesome in my opinion, but land destruction is already being silently phased-out, so it's very unlikely that they will give it such a powerful card as this.

The most realistic set of abilities I can think of that remains viable is the "lightning helix" sword. This seems very uninspired considering it's just a combination of the red and white abilities from the previous swords. Also, being the last in the cycle of five makes me think that they would do something more exciting than this. Since the green ability on SoFaF is somewhat nonstandard (would have expected rampant growth), perhaps they will come up with something else that is rather nonstandard for the RW sword as well.