Sure, fast mana can make for a brutally unfun Mind Twist on turn two, but lots of decks, for example the Painter's Servant deck, can win before that
Indeed, the single biggest problem with taking the long-form approach to deck building is risking the very real fear of running out of steam
(2021-07-23) If the spell that causes the last ability to trigger is countered or is otherwise no longer on the stack as the ability resolves, it will still deal damage
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Whilst the 200att boost will very rarely if ever come into play, it does synergise with their removal spell and can allow you to sneak out more exact lethal opportunities on occasion
That said, the weak Vehicle side means this is still an outside chance