We saw this in the original Time Spiral days with Teferi, Mage of Zhalfir, but the heavy casting cost and vulnerability to removal (i.e

Cards from Revised Edition and Unlimited Edition have the following characteristics: No expansion symbol No copyright date Unlimited cards have a double beveled inside border, while Revised cards have a single beveled border Unlimited card titles are more left justified than Revised Unlimited card ink colors are darker than Revised 4th Edition & 5th Edition No expansion symbol 4th Edition has a 1995 copyright 5th Edition has a 1997 copyright 6th, 7th, 8th, 9th Editions 6th Edition has a "VI" expansion symbol & copyright 1993-1999 7th Edition has a "7" expansion symbol & copyright 1993-2001 8th Edition has a "8" expansion symbol & copyright 1993-2003 9th Edition has a "9" expansion symbol & copyright 1993-2005 Other Sets Chronicles: Chronicles cards are white bordered reprints of cards from Arabian Nights, Antiquites, Legends and the Dark, and have a 1995 copyright date
For each deck five of the Planechase cards are new, while the other five are reprints
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Usually people do this because theyre a bit too touchy-feely, but sometimes its with the intent to manipulate you into making a given move