You dont have to keep track of exactly which card came from what pack, but I recommend recreating packs with the appropriate ratio of commons, uncommons, and rares/mythics
-3: Target creature gets +X/+X or -X/-X until end of turn, where X is the number of Swamps you control
So they usually play along, and help contribute to the greatness of The Rig
It costs a lot of mana but lets you storm off in the late game if you have Lessons in your graveyard along with a cost reducer like Goblin Electromancer
Each Dominaria United Commander deck comes with a Collector Booster Sample Pack, which contains two cards: 1 Rare or mythic rare that can be traditional foil, showcase, extended art, and/or a borderless planeswalker 1 Traditional foil showcase stained-glass uncommon Your Collector Booster Sample Pack might contain a special version of one of the cards in your Commander deck or a card perfect to add to another Commander deck