mtg scene box cards Magic: The Gathering | Marvel Super Heroes - Villains Unleashed including the Serialized Elven the Lord of the Rings:

If you can't get the Secret Lair directly from Wizards, you might find the products on the secondary market, and a sealed one should retain all marketing components, including a potential card with your code for digital versions

These are the kinds of cards that pay off lifegain in Golgari, just like your commander

As one of the best MTG sleeves, it supports double-sleeved cards, fitting ideally inside the binders

II - Add

Preventing your spells from being countered allows many of your most powerful plays to go ahead unimpeded

Others are dual lands, and yet others are triomes (can produce three different colors of mana) which are awesome for decks trying to cast multicolored cards