A deck that focuses on ramping up mana quickly, such as a green-based ramp deck or a deck that relies on color fixing with Gates, would benefit from using Explore the Underdark
Pillar Analysis: High Power (Dual Land), Scarcity (Beta, Reserved List), Format Staple (EDH/Vintage)
I turned Legends of Avantris Icebound Characters into Magic: the Gathering Cards You ever watch something and think this is cool, but I wish it was also a Magic: the Gathering card
So it seems the price spike is purely down to numbers: the fact that demand for the card has more-or-less doubled, while supply has remained the same
As always when forming ranked lists, Im judging these cards on power and efficiency, looking to get the most impact for the least mana