Hi Milo! Are you a new player? If yes, I like the list a lot, simply because you will learn how to play with Alarielle (you will most likely use her in a good amount of bigger games as well). There are, however, some points I would like to treat:
(1) Is it a "newbie" tournament where people will most likely show up with a starter box + some "random" stuff? If yes, you should overthink taking Alarielle.
(2) Are you playing on 48"x48" tables? If yes, I would skip the verdant blessing, since you will most likely have enough "forest presence" [see (3),(4)]
(3) I can deeply recommend Throne of Vines on Alarielle. It makes her other casts even stronger/the pendulum safer. It also gives you the 1-2 additional mortal wounds on Metamorphosis you will most likely welcome especially at lower point levels.
(4) If you want you use the Dryad summoning with the Branchwraith, I would swap Ranu´s Lamentiri with Arcorn of the Ages. You can not really control wether your starting Wyldwood will be on your side of the board or not. A Verdant Blessing on Alarielle "only" suceeds on a 6+, which is also not super reliable. Ranu´s will give you Regrowth on a 3+ instead of a 5+, which is often times not necessary. Roused to Wrath on the other hand will only recieve a +1 bonus from Ranu´s (since it is not part of the Deepwood Spell Lore ) - this puts it on a 6+ instead of 7+ to cast, which is a very relevant improvement, but in my view simply does not cut it in relation to the "I need a safe Wyldwood to start summoning in the first place" -issue.
(5) You say you will summon Scythe Hunters with Alarielle. If you have, up to now, a limited model range and no other options that is perfectly fine (and you will end up with summoning Hunters a lot anyways). But if you have a wider model range allready, I would recommend bringing other options to the tournament. Deciding what you will summon in any given game is a really strong aspect of Alarielle´s ability.
Hope I made everything clear (no native English speaker). Side note: I am not a super experienced player myself (assuming you are kind of new) - so take everything with a grain of salt. I would be happy to discuss the points I made further (if you/anyone wisheS to).