Even discounting Skullclamp ($1.99) and Sol Ring (which is in every Commander 2017 deck but, as the most played card in Commander, is still worth $3.27, even with a ton of reprintings), the Vampire deck is overflowing with artifact value, with Door of Destinies being the single most valuable colorless card in in Commander 2017 at just under $6, along with Well of Lost Dreams and Blade of the Bloodchief, both coming in between $3 and $4
His value is rising, too, with a market value of $250 but already selling for more than that
(Put the top two cards of your library into your graveyard.) The ability that defines Splinterfright's power and toughness works in all zones, not just the battlefield
It can grow to ridiculous stats if your opponents are constantly casting spells
And that's before demand has had a chance to drive prices up even further
This gives you access to lots of extra resources, but your deck is susceptible to graveyard hate