During reveals a lot of people were talking about how Wardruid Loti could be used in Malygos druid. But I looked around and looked at statistics and she doesn't seem to be used all that much anywhere, on HSreplay she is still in sparse data. But I was trying various decks in Brawliseum, so what I tried is in flex slot where you usually see second MCT or Lich King, I tried Loti instead. And I went 12 wins. Of course deck core is strong enough that Loti didn't play big role, but she was a good inclusion as far as I see it. Below you can find the list and in description you will find my whole journey through Brawliseum, but under the deck link I want to focus on what are my finding about power of the Wardruid Loti.
So basically Wardruid Loti either replaces Lich King or second MCT in standard builds from previous expansions. I played the Lich King version before the expansion, and what I find is that even though Lich King is a threat and generates some values, he makes UI more awkward and that is probably the reason why double MCT version was still popular, because 8 drop is just a lot more clunky than 3 drop.
So how do 3 drops compare? Well MCT is often just a useless 3 mana 3/3 in my hand, which doesn't do much, nad against decks that do go wide you get a 1/2 or maybe 2/2 quite often which is just whatever, doesn't change much as they SMOrc you anyway, while play 1/6 taunt for 3 was just good against those decks. Your opponent would need to deal with taunt, and if they have only 3 minions, all the better the girl is likely to stick then if those are just small fries. MCT definitely saw a lot less action than Loti, and I was happy to have Loti when I didn't have wild growth most of the time.
So 1/6 taunt seemed to be a default mode for me and it was good, because mostly i needed the guy either to stick and not a lot of stuff in current meta deals 6, so she would often take 2-3 hits to die.
What I can tell about other modes:
Stealth seemed to be somewhat usefull when I needed to make my opponent turns awkward, and I once used that mode to bait the Dyn-o-matic so that next turn I can just UI him more safely. But basically stealth poison mode seems to be relevant mostly against other value/control decks to get incremenetal advantage.
Rush 4/2 mode I found useful against opposing spreading plague mostly. other than that, just a back up removal is interesting, but most of the time not worth it if they have 2-3 minions at least.
Spell damage mode, didn't get to use yet. I had once board created by some aggro deck which lined up really well for Loti Spell damage plus swipe, but just spreading plague seems better in that case and you can just do a swipe next turn... but a nice backup to have.