I would rather stiftle, trickbind or voidslime the trigger when it leaves play if you want to use this card for land removal. That's not only cheaper than Eon Hub, the latter one might also get destroyed which will cause your opponents to get their lands back.
Additionally, this could also find use on yourself:
Given that you control at least five lands, this will return all of them untapped.
Cast High Tide for instance, then Parallax Tide, remove your islands, get them back, and tap all of them again to get 10 blue mana.
With accordant Landfall abilities, this will be even more fun since you will trigger each of them five times. This will charge all of your Landfall Quests, Hedron Crab for example will mill 15 cards, Lotus Cobra provide 5 mana of any color, Emeria Angel five 1/1 white... (see all)
Posted By:
Mode
(11/14/2009 6:25:32 AM)
Auratog in response to activating it. Much, much better than those other dumb shenanigans.
Posted By:
Folesauce
(2/18/2011 8:58:58 AM)
This card works great with Vedalken Mastermind. Play it, use each activated ability in response to each other, then bounce it with the abilities still on the stack. Pay 2UUU to exile 5 lands forever, every turn? Seems like a pretty good deal if you can get it going. Though it's the "if you can get it going part" that might be hard. And the ability to use it over and over would really only be good for demoralizing your opponent.
Posted By:
ForestFire0
(8/1/2011 11:00:11 AM)
What about using bounce back cards like crystal shard, vedalken mastermind and the like. Every turn you make sure they never have lands.
Posted By:
Graymt
(3/25/2010 8:37:49 AM)
Even without any tricks, this is pretty good. Wiping three lands for two turns on turn four is more or less equivalent to casting two Time Walks.
Posted By:
GrimjawxRULES
(11/9/2011 3:03:47 PM)
@Hunter06: You can't ramp with Parallax Tide unless you tap and exile your lands in response to the fading trigger during your next upkeep. You'd only have the mana during your upkeep, although you could easily go from five mana to ten mana. Or much more, if you're playing something like Tolarian Academy.
You might be confusing Fading with Vanishing.
Fading makes you sacrifice the permanent when a counter can't be removed by the upkeep trigger.
Vanishing makes you sacrifice the permanent whenever the last counter is removed.
@Ragamander, @xlinplips, and @blurrymadness: You could also wait a turn, tap for 
(or more), exile four of your own lands, and cast Armageddon. They have mana for an extra turn, but the subsequent setback is far stronger than Limited Resources, Cataclysm, or Sunder...or even Balance if you have five or more lands.
Posted By:
OneFishTwoFish
(9/20/2013 3:19:30 PM)
Remove your own lands and then add Limited Resources, Balance, or Cataclysm.
Posted By:
Ragamander
(11/18/2009 10:21:27 PM)
With Eon Hub, this is like a little onesided Armageddon.
Posted By:
holgir
(8/6/2009 8:23:28 AM)
combo with storm crow
Posted By:
CharnelhoardWurm
(7/31/2010 7:08:15 PM)
Contagion Clasp, Parallax Tide, Parallax Nexus. Yes, I am that evil.
Posted By:
DarthParallax
(11/10/2011 9:32:11 AM)