This could be an interesting change, but as drecon84 points out in the comments of the Blogatog post, changing this rule just for Commander and not for other formats is far from ideal
It forces your foe into an uncomfortable choice
Its power and toughness wont change as cards enter or leave your hand, but its triggered ability will still function.
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It is not impossible to stop with about 3 interferences, but no matter what, you will end up letting them draw 2 or 3 cards
Because Greater Realm requires white to activate, you must be mindful of impending Sinkholes, Stone Rains, and Strip Mines