Im a huge fan of Ninjas in Cube as a way to push blue and black to get more involved in combat, and we recently dedicated an episode of The 540 to the tribe: I wouldve loved to see a red Ninja or two, but alas
Vanille, Cheerful ICie The better half of the meld pair of Ragnarok, Divine Deliverance, Vanille serves as an almost Eternal Witness for you, while also milling a bit, and if you get her together with Fang, Ragnarok can be real threat, but thats best left to kitchen table aspirations
It even shares the mana value of Gravedigger, so I get why this card costs this much, even if I would never build around it
While you cant play many wraths in Simic least of all Farewell you can still play Oversimplify, which Im thinking more Simic decks need to run, to be honest