[Anchors]

10 MR's accuracy is better than 10 storm's, I think... or they're close, at least. At level 55, I missed similarly with either in art room on separate 1414 sheep.

For wind blade vs terra, wind blade, because of its speed, allows you to take on very high-level monsters. With MR and wind blade, I soloed my wind sheep from 61 to 80 at art room - I tried art room with an earth sheep, too, but it was actually much slower, even after I got storm, because the art room monsters aren't tankable at those low levels. (At lower levels, because you can't walk into a mob and survive the 1.5s cast time, it's hard to take advantage of terra's crazy AoE.)

Unless you have absolutely no LK gear, I'd recommend getting wind blade (and MR) first. Terra is something that's great a little later on, but wind blade is great the instant you master it, pretty much regardless of level.

Incidentally, training on monsters that are lower level than you nets you an exp penalty... You might consider moving from path to oops to somewhere a little more advanced.

<edit>10 MR/10 storm are probably fine. I would really recommend mastering MR and getting MR booster eventually, though - the speed is really nice when you have really high MA.