Research the HECK out of those boxes..make sure you know what the plastic outer wrap is supposed to look like..dont buy boxes that are damaged..if a seller has terrible feedback online, just go somewhere else
Some decks just lose to the random taking of their key card
The ETB captures Negans ruthlessness, and a Mardu commander gives you access to more death payoffs (Revel in Riches), Treasure doublers (Xorn), and blink effects (Teleportation Circle)
Jund Reanimation - Where you discard things to reanimate to Dread Return, Eternal Witness or Living Death
There are multiple ways to get around Baba Lysaga's restrictions too, including being able to sacrifice tokens or cards that have multiple permanent types
You gain X life, where X is the greatest number of creatures you control that have a creature type in common