That gives players opening their free packs each day, with some trading and sharing thrown in, just enough chance to unlock most of the base cards in a set before the next one arrives
Players are most likely going to get common cards and a few of the rarer ones when purchasing packs
For instance: if you had three Clues, enough mana, and all the relevant cards exiled under Lazav, you could cast Cackling Counterpart targeting Lazav, hold priority before it resolves, sacrifice a Clue to trigger Lazav to transform him into Marionette Master, hold priority again, sacrifice another Clue to trigger Lazav to transform into Octavia, Living Thesis, hold priority once more, cast Armor of Shadows, let everything resolve, then sacrifice a final Clue
They typically play this role with protection-style effects, lifegain, or simply by being absurdly powerful in combat
We moved closer, but not so close that it would disturb the art as we spoke