Golem Artisan | Magic: The Gathering
Formats Golem Artisan is Legal in
Official Oracle Text for Golem Artisan
: Target artifact creature gains your choice of flying, trample, or haste until end of turn.
Official Rulings for Golem Artisan
1/1/2011 : You don't choose whether the targeted artifact creature gains flying, trample, or haste until Golem Artisan's second ability resolves.