A maxed Oshannus rents VERY well
The Oshannus is in my opinion the most powerful legendary card among the reward cards and it's very difficult to fight especially when fully developped. I'm collecting my copies at the moment hopefully to get at least one fully developped one...
Yeah I rotate between him and Phantom of the Abyss when I'm doing Water battles...Not all the time, but he's great!
Oh no keep that PHANTOM monster away from me the evading ability of that monster against range and melee monsters is second to none, I hate coming up against it.