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)

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

Sheoldred, the Apocalypse is another expensive card that doesnt really need to be here

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

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

One easy way to circumvent this weakness is running High Market so you can sacrifice it at instant speed and prevent it from getting exiled