To build a new deck (Magic Assistant has no concept of a cube, but functionally a cube is arguably no different than a deck), right-click on the Deck category in the Card Navigator panel, then select New to create a new deck
Mana abilities dont use the stack, and other activated abilities of lands arent spells even if they use the stack
Urza's Incubator is another one that might be right at home here, I guess it depends though it wouldn't really net you much value over say a Worn Powerstone unless you are playing multiple rats on an average turn
If my experience losing out on the PS5 several times over ~2 years via Amazons invitation system is any indication, my advice would be requesting an invitation for all Lorcana products that you might want to purchase, as it will presumably increase your chances of success
In a statement, Target said that it would "temporarily suspend the sale of MLB, NFL, NBA, and Pokmon trading cards within our stores," but would still sell them online
A card counts the expansion symbol that's on it