52/82 Diglett
When combined with Auras and Enchantments such as Aqueious Form and Finest Hour, Isamaru, Hound of Konda can even threaten to take opponents out of the game with Commander Damage alone
The Ringhart Crest fails to make up for the failings of Kolvori
Oh, and if you're looking for some good scary flicks for your Halloween viewing you may not know about, I highly recommend checking out The Beyond , The House of the Devil , and Hell House, LLC
This is by far the trickiest of the questions in deck construction, and the one that is also easiest to get completely wrong
I intentionally went for higher-value cards not only because they had higher margins (and downside protection against occasional losses) but also because of their enhanced liquidity/sales volume (they are generally more sought-after cards despite their relative rarity)