Sometimes this is done for flavour reasons (they needed a certain effect at a certain mana level, but the original printing doesn't work for a plane where, say, the Llanowar Forest does not exist)
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Its ability counts tokens, so cards like Basking Broodscale, Herd Baloth, and Scurry Oak that create tokens when +1/+1 counters are placed on them can go infinite with this and a sacrifice outlet (though the Broodscale needs no help)
All of these were printed early on in Magic's lifetime - in Alpha, Beta, or Unlimited - before balance had been fully figured out
A reimagined underground Hollow Earth concept, remade specifically for the plane of Ixalan
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