Secret lairs are mini-sets containing a handful of cards a regular Magic expansion wouldn't have room for
In straight up combat, Mishra kills in five attacks to commander damage
When it comes to gaining cards, you can also randomly get one from a pack someone else has opened, for a separate currency that recharges at a slightly faster rate
(I seem big and strong and until you prove otherwise, I am.) The most famous example of this would be Illusions of Grandeur (from Ice Age )
Kuja, Genome Sorcerer // Trance Kuja, Fate Defied Rarity: Rare TYPE: Legendary Creature // Legendary Creature SUBTYPE: Human Mutant Wizard // Avatar Wizard CMC: 4 Mana cost: USD: $41.87 EUR: 22.79 TIX: 0.00 EDHREC RANK: 3296 (3/4) At the beginning of your end step, create a tapped 0/1 black Wizard creature token with "Whenever you cast a noncreature spell, this token deals 1 damage to each opponent." Then if you control four or more Wizards, transform Kuja