Namely:

It will use it for no apparent reason:



And then again, when it draws another one:



Then again, to make it possible for it's creature to kill mine in case I block (if I block it can still kill my creature without it, I can't kill its creature in any case, and even though I didn't block it didn't do any damage):



And then it cast it before combat to kill my creature with no attack power, even though it could first attack and if I block it with any creature kill either (or both):



And these are the only screenshots I took, but it had a lot more strange moves with this spell in particular.