MTG also has thousands of players worldwide which creates a problem: gift cards would have different values in different countries
Rare is where we're willing to shrink font size on a small number of cards
If you're sticking to the Vampire Aristocrats theme then the first cards I'd pick up would be Vampiric Tutor (finds Skullclamp and has Vampire in it!), Bloodletter of Aclazotz which doubles your drain / damage output on your turn absolutely wild, Bloodline Keeper provides sac fodder and a strong anthem, Legion's Landing nice thematic ramp, and Sorin, Imperious Bloodlord thematic ramp and removal
(At the beginning of your upkeep, remove a time counter from that card
I dont think you need to make a move on this card otherwise, but it would be something I would monitor inventory levels on if Slivers showed up in a new Magic set and gave someone the idea to try and corner the market
Cards with this rarity have a pull rate of 0%/0.5%/2% as the 1st-3rd/4th/5th card