You may not be able to literally select which cards are going to the graveyard with each discard spell, but by paying attention to what cards your opponent keeps and what they give up, you can try and time your punches to cut off their decisions and paralyze even the most powerful Constructed decks
Pay X energy counters, Sacrifice a creature, return Chthonian Nightmare to its owner's hand: Return target creature card with mana value X from your graveyard to the battlefield
Brothers Yamazaki allowed you to have two of the same legendary creatures in play at the same time
Imagine warping in Quantum riddler getting the card draw, sacrificing it to pyre, putting in an absolute bomb
6 Marath, Will Of The Wild A flexible Naya (green, red, and white) commander introduced in Commander 2013, Marath, Will Of The Wild is a three-mana Elemental Beast that enters the battlefield with a number of +1/+1 counters on it equal to the amount of mana spent to cast it
Magic: The Gathering is a card game thats been around for a long, long time