I especially like Earth King's Lieutenant as a cheap ally buffer
At the same time, another popular card among Pokmon fans, the Yellow Cheeks card is valued at the highest price, around $100
In rare cases when you can get your hands on MTG Final Fantasy stock, the precons are still pretty prohibitively expensive
Shock lands, triomes, Eldraine lands
In theory, there could be decks that don't want Glasspool Mimic (ones that have almost no creatures), but even with just a handful of creatures worth copying in your deck, it's significantly better than the Island it will likely replace
Ral, Monsoon Mage / Ral, Leyline Prodigy Ral, Monsoon Mage is fantastic on its own as a quick way to cut your spell costs and is a Birgi, God of Storytelling away from storming off