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Using my version of Revan's custom mechanic Mount, which Tommia helped to adjust.
Original: Mount [cost] ([cost]: Attach this creature to another creature you control. It can't attack or block.)
My version: Mount 'creature type' [cost] ([cost]: If this creature isn't mounted, put this creature over target unmounted 'creature type' creature you own, mounting it until either leaves the battlefield. This creature can't attack or block for as long as it's mounted.)