I can't seem to design a common card with Remnant. Like Cyclonic Rift, the normal mode on this one isn't rare-level, but the final mode definitely is.

So, when you flash this card back, you can put two extra lands onto the battlefield? Does your set have any Karoos? Because they seem pretty relevant.

With this, 4 lands, and a 1CC mana dork, you would have 5 mana at the beginning of turn 3. The setup (T1: land, dork. T2: land, this, land, flashback this, land.) seemed really cool in my head, but it's really no better than playing a dork on turn 1 and 2 more on turn 2. This is more permanent advantage, true, but you'll quickly be playing only 1 land per turn once you dump your hand. I was originally going to comment that this was really good ramp, but the resulting comment (this) convinced me it was merely good ramp.

Shoot. If you have three of this and three forests in your opening hand, you can play them all: Forest, this, forest, this, forest, this... other land. Obviously that's a dream hand, but that probably means this should cost like Explore.

Not really any different than Exploration, though. I don't remember anyone having any real problems with that card (though, it was in Urza's Saga, so who's to say? Broken cards were hidden in that block by even more borken cards).

Do most cards with remnant end up with the flashback effect the same as the spell effect? Because this works out as:

Cast: get two more lands this turn
Flashback: get three more lands this turn (because the spell gives you two and the new static Remnant effect gives you one)

This one, Valor's Levet, and Fearful Omen have a greater effect the turn they're exiled.