Marnie belongs to a character archetype known as the tsundereone which is hugely popular among the Pokmon TCGs primary demographic
Both choices are bad for the opponent and usually are effects slightly stronger than the mana cost would normally allow
Though Colorless could technically be seen to be a Basic Energy and it is, after all, a Pokemon type in and of itself (representing the video games Normal, Flying and Dragon type Pokemon) there are only Special Colorless Energy cards, not Basic
This put a lot of fresh MTG eyes on Longshot, Rebel Bowman, which ultimately led to a buying frenzy and the cards subsequent price spike
KSA Certification is a Canadian-based grading service that offers same-day turnarounds, though at the cost of $100 per card
Since many opponents do not use cards against your Spells/Traps, the use of stalling cards like "Gravity Bind" can make winning very simple