There are lots of activated and triggered abilities these days, but you don't always have mana left over to copy them
In decks that can stabilize or gain life back, this becomes one of the most efficient engines ever printed among MTG black cards
While slightly higher on the mana cost scale than most other Elves, Dionus comes with a strong ability to make it worth it
Were I looking at it from building a top 20 list, I would exclude this from consideration as the grading increase holds pretty level across the harder to find cards
Despite the drawback of only being able to activate Tataru Taru's ability once per turn, there are still plenty of opportunities to build up a considerable horde of valuable treasure
Arahbo remains the best Cat commander, but I think that has more to do with the fact that Kaheera, the Orphanguard is the only option thats been printed in the years since