fabricate mtg card (Card) then shuffle. Fabricate | Secret Lair |

It effectively shrinks your deck so that instead of running 60 cards, you can run 56 (with some little timing hiccups)

The three biggest were the Brothers' War, the Phyrexian Invasion (well, the first one), and the Mending

Commander Commander (CTRL to add secondary) Burn Burn (CTRL to add secondary) Discard Liliana, Waker of the Dead +1: Each player discards a card

You just need to lock the game down until your opponent is out of cards in their hand, and then slowly chip away at them

When paired with cards like Gray Merchant of Asphodel, Exsanguinate, and Blood Tribute, you can rip through an opponents life total in no time