Malcolm, the Eyes decks are all about cheap spells
Even more sadly, free codes isn't a trend that was carried on by the far more available Commander precons
The only thing that you can safely trade for in bulk are commons/uncommons for decks (Yanma, Magnemite, Phanpy, etc), or average Trainer cards like Switch, Energy Retrieval, etc
Using Lurrus of the Dream-Den as an example, the 3 mana card could be put onto the battlefield from outside the game so long as You pay its mana cost and Each permanent card in your starting deck has converted mana cost 2 or less
You can explore the set early with WPN Premium Preview Events from January 1723, and House Markov cordially invites you to the set's release on January 24, 2025
one of these is consumed each time you attempt a battle