It's just weird and wrong
Caring about the mana value of spells is a theme that runs in opposition to traditional Spellslinger strategies that want to chain together cheap, low-cost, and efficient instant and sorcery spells, and consistent token generation gives the deck a more impactful board presence to fend off attacks
Card not found is just too expensive to use these days and exile effects are rampant anyhow so, thanks WotC, of reminding us how the game used to be fun
Singable but uninkable at 3 feels like a good balance
No matter your strategy, youre still pulling from the exact same pool of draw spells
The downside to Captain Rex Nebula is if the permanent you made into a Vehicle does damage, you'll have to sacrifice it as the crash land ability is mandatory