So... as long as this isn't your first turn, it's an island or plains, plus one mana in your pool. I think that means the replacement had better ETB tapped at the very least.

Why do you say that? I actually think it's fine as is, since you don't actually accelerate your mana. I like this a lot, actually.

I'm waffling on this a little: this cycle DID start out ETB tapped (though I must mention the inspiration was originally Krosan Verge). The Panoramas and Terminal Moraine say it should probably put the land on the battlefield tapped, though.

It's probably best to compare this card to a dual land, then to Evolving Wilds. Compared to Glacial Fortress, this seems spot on. That infers to me, however, that this is a rare, for what that's worth.

I'm aware that I can probably have only one cycle (especially not fetchlands and full duals together, though I like the fact one's an allied cycle and the other is enemy), I'm just not sure which yet.