First of all, when I say free, I speak about the mana used to cast them , so I'm still allowed to pay other costs, like discarding cards, sacrificing creatures, or paying life
If you have them, consider adding any of these cards in place of some of the less-efficient dual lands or even basic Swamps or Plains: Shadowy Backstreet, Concealed Courtyard, Isolated Chapel, Brightclimb Pathway/Grimclimb Pathway, Godless Shrine
What this means is when you have it enter the battlefield, you get a ton of Treasure tokens since it adds up the total number of all artifacts and enchantments across all your opponents
This is a know your role kind of card, as even though it is technically available to anyone, it only makes sense here because were shifting to a more controlling build of the deck and need to not die to a narrow class of stupidly powerful problem cards
Each pack contains four cards, one of which will be a rarity card or higher from the Genetic Apex set through to Wisdom of Sea and Sky