Like most Magic: The Gathering cards, the value of Kaldra Compleat depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (The List)
As far as cuts: I think Thorn of Amethyst could probably be substituted by a stax piece that is more in your favor, like Aura Flux or Smoke
One card to watch out for in pushing a new tribal direction is Plague Engineer, but I dont think its going to be all that problematic for most decks
You can also use David Xanatos Steel Clan Leader (or other draw-then-discard cards) to put an Item into the discard straight away
However, if you pay the Kicker cost by tapping a Vampire you control, you gain life equal to the life lost this way
If you roll a 1, Goblin Tutor has no effect