Olivia Voldaren Olivia Voldaren lets you convert your opponents' creatures into vampires and then steal them over the course of several turns
Efficiency can be determined simply by the reward you receive at certain mana costs (Counterspell and Cancel do the same thing, but Counterspell costs less), the total payoff you receive from a single card (Hull Breach and Decimate are both good cards, but Decimate usually covers much more ground), or the payoff you receive in conjunction with other cards (Anointed Procession makes other token production cards completely absurd if unchecked, which is usually better than adding one more card that simply makes tokens like Spectral Procession in a token strategy)
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There are other little updates included as well, so poke around and check it out
Still, there are a few I like
Overall, Ghalta is a great Dinosaur and should be included in your Dinosaur tribal decks due to how powerful it is
