The real mean interaction involves Displacer Kitten, whenever you cast a spell from the yard using Noctis, the Kitten blinks a permanent, which can be used to reset finality counters or draw extra cards to offset the life loss
In a three-color deck it's better than a Guildgate by giving you the flexibility to choose one half of its mana
Those cards are pretty weak in draft alone, but Tough Cookie can make them worthwhile until their self-sacrifice abilities are used.
While tapping ten Elves (11, including Lathril herself) sure sounds like a lot, its exceedingly easy to snowball with Elves and create a critical mass of them in a short amount of time
So, lets get this started, shall we
But she really shines with her ability to make your opponent pay 2 mana if they wanna cast spells outside their turn