Granted you do lose them all if its destroyed, but if you exile every plains you had that would be rather silly. Knights is a fairly aggro deck anyway so if you remove 4~5 plains, you've got guaranteed mana for a few turns and if you lose them its not the end of the world. The rewards outweigh the risk in my opinion. Also if its not working I can always just sideboard them.
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Hmph, cant honestly think of anything I could replace that with to make it standard-legal. :(
Oh god just realised that time warp isn't standard legal (facepalm)
Quickly gone and re-edited it! I do like your idea with the rings but was aiming on keeping the deck standard-legal. Added the titan forge to further use the proliferate mechanic and give yourself a bunch of 9/9's to have fun with.
Ah bugger, didn't read the card properly! Question though. If I chucked in a couple more Lighthouse chronologists then wouldn't their level 7+ ability (another reason for the proliferate) make the initial cost of putting an eon counter on magosi the waterveil less harsh?