I highly recommend starting with one of these: Solemn SimulacrumSolemn Simulacrum, Skyclave ApparitionSkyclave Apparition, and Whirler VirtuosoWhirler Virtuoso
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Five are earned each time and they can be accumulated to use in the Pack Points Exchange Shop, which allows trainers to swap for cards
Shandalar uses old rules for mulliganing, where the only hands allowed to mulligan are those that consist of zero or seven land
When x happens, draw a card seems to make up a large portion of many recent staples, and more and more legendary creatures with a built in card draw engine get printed and played, so having your opponents discard down to 6 instead of 7 can be a great way to slow down their game plan