well, she's just not that good
If this vehicle did something when it came in or could attack right away, I could see it doing something
The CEDH community is the perfect people that you should be approaching for feedback for this specific issue: people like Play to Win, The Spike Feeders, Playing With Power, Casually Competitive, Laboratory Maniacs, the CEDH subreddit and more, this community is KEENLY familiar with C16 partners (their metas have been dominated by them for years!) and have tons of experience identifying the most degenerate things that can be constructed by any pile of cards that you throw at them
I figured speeding up the life-draining/damaging process would also be helpful if you wanted to run this deck as the archenemy, as therell be more pressure on you to close out the game quickly when it's one-on-three
There are even pseudo-combos available with cards like Sheoldred, the Apocalypse and Queza, Augur of Agonies, where you can draw as deep as your mana allows