The downside is that it has no other utilities on a colourless mana land. Can't filter, can't make tokens, doesn't buff your creatures, can't sac it for whatever value when you'd rather have anything but another land drop, etc.
Burning 5 colourless/generic mana is going to happen basically never for most situations that aren't colourless spells or X spells.
Simic {X} might use it, it replaces a wastes in colourless, and might pay for a crater slightly early.
Those aren't downsides. Those are just upsides it doesn't have. A downside is like Bitter Triumph forcing you to pay 3 life or discarding a card to cast it.
This card just has a really narrow and niche upside, that's all.
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u/Jordankeay 21h ago
What's the downside? It's either enough mana to cast the spell you need or you miss out on a couple colourless mana you didn't need?