CommentStreams:228a75d1b782f6dcd4b0fb2a2ce9a3c1

Cheapest way is to open the silver boxes from the store, 60 times for one Magic Apparatus opening. If your deck is strong enough each silver box would cost you ~1.5k gold, or 90k gold total, which is equivalent to 30 gems. You'll have to open 40-50 MA level 6 coffers, so it'll cost about 1200-1500 gems.