Erode makes that line a bit more of a reality
The grade reflects how good of a condition the card is in
Iconic Cards: Counterspell, Ponder, Damnation, Jace, the Mind Sculptor Popular Decks: UW Control, Jeskai Control, Taking Turns, Esper Control 3 Midrange Midrange decks are popularly said to solve problems, not create them. In other words, these decks are sort of designed to be able to win against every archetype, although they wont bulldoze over anything (the way aggro often wrecks control, for example)
You gain life equal to the number of creatures you controlled that were destroyed this way
Boss's Orders has gone on to become one of the TCG's most annoying and powerful cards and any modern player can instantly run in fear the second they see it