Cards like this have inherent flexibility in that they cover two slots on your curve and also mitigate the drawback of being legendary by being two different cards in one
While Master Ball holos were originally a Japanese-exclusive from Scarlet & Violet: 151, their English debut came in Prismatic Evolutions
I bent my rules just a bit for this card, since it can keep my battlefield presence even in the face of a battlefield sweeper, and since the Spirit creature tokens have flying, they can continue the quest for coolness
8 Niv-Mizzet, Guildpact (Rainbow Foil Serialized) Murders at Karlov Manor Market Price: $726.21 The Firemind himself, Niv-Mizzet, is a beloved character across Magics history (and a legendary WUBRG card) that anchors various storylines in the plane of Ravnica, including during the events that took place for the Murders at Karlov Manor set
Excellent (EX) Lightly used - minor marks or wear, but still nice and well-maintained
It's worth noting that these two lands are part of a five-card cycle, one for each color