If you stick solely to Vampire Aristocrats like the precon promotes then I think Clavileno and Carmen are about the same power level where it boils down your own preferences and your own meta: Clavileno is cheaper and provides a slow but consistent payoff, whereas Carmen is more expensive but also more explosive and randomly becomes more powerful if you happen to play against decks that sacrifice a lot (fetchlands, treasures, other Aristocrats etc.)
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You'll spacewalk through the Sothera system, an enigmatic realm at the far edges of the Multiverse
With the perfect draw, it is a plains that taps for two or three on turns three and four and lets you push out a couple of extra cards
This number is typically represented in the ###/### format, with the first number on the left identifying the specific card number within the set and the second number on the right identifying the total number of cards in the set
Free graveyard interaction at instant speed that any deck can play has value