Of course, if you have a copy of Urborg, Tomb of Yawgmoth or a Marsh Flats, go for it, but its not needed here
What If My Card Has No Rarity Symbol
The only other character card that can do that right now is Pinocchio Star Attraction, and its played in many competitive aggro decks
Putting that on a really good other ability (not to mention those seven starting loyalty counters) makes this a card that you can also just play for value
In particular, because Saskia encourages combat, we want our creatures to reward us for our aggression either through combat buffs or smashing ability
Prismatic Evolutions has been one of the hardest sets to find at retail since its launch, and the Pikachu hyper rare benefits from that artificial scarcity on top of its inherent desirability