Its specifically powerful in Commander, with three opponents to draw mind-boggling numbers of cards with Rhystic Study and The One Ring and so on
Before we get to the cards, its worth thinking about what makes the best MTG commanders, and some of the qualities our top 10 legendary creatures below share
Having the discard not be a cost is usually an upside as you don't lose the cards if they counter it, but in a deck like dredge this will at times be a drawback as you actually want to put cards in your graveyard
What a treat
They often exile one or more cards from the graveyard as seen on Rest in Peace, but some hate cards shuffle graveyards into their owners library, like Endurance
This can be by preventing your opponent from attacking you, or by stopping them for activating certain effects: if your opponent cant do what they normally would, theyve been stalled