In Magic, Dragons are expensive -- both in terms of their high mana value but also high monetary value, as the extremely popular creature type comes with a "Dragon tax" where all the good cards are worth far more money due to being a Dragon than if they were any other creature type
Considering Trickstar Reincarnation starts out with banish your opponents entire hand, its definitely much closer to cool than not
Once you've got Selvala tapping for at least six mana (this can happen as early as turn three), you can pair her with cards like Wirewood Symbiote + a mana dork, Umbral Mantle or Staff of Domination that untap her for a portion of the mana she makes
If heads, switch 1 of your opponents Benched Pokemon with their Active Pokemon
Also, lest I forget, Buddy requests that you be sure to send him some of those very big tablets, quite without lines, for his haunting stories