These cards just increases the mana cost of your opponent's spells, and while Thalia, Guardian of Thraben is a symmetrical effect (it affects you too), it is an extremely good card to drop in Turn 1 or 2 while your opponents are trying to play mana rocks or ramp their lands
I think the most interesting part of this analysis though is in theory if you owned each of the cards you would have had $22,965 of cards at September 2017, and three months later those cards would be worth $28,036
Bushy Bodyguard To me, Bushy Bodyguard is more useful when you have more mana to pump into it and its offspring
A Litten briefly appeared in GOTCHA
This number includes all cards from all sets released up to that point, including special sets and promotional cards
Part of a set of only a dozen promo cards, its now estimated that the value of this collectible has gone up to nearly $150,000