Cosmogoyf + Jarad, Golgari Lich Lord + Arc-Slogger

Cosmogoyf

Jarad, Golgari Lich Lord

Arc-Slogger

How it works

1. Activate Arc-Slogger by paying and exiling the top 10 cards of your library, dealing 2 damage to any target.
2. Repeat step 1 as desired. It is recommended to do this until your library is empty or until the amount of cards you own in exile is greater than or equal to each opponent's life total, whichever comes first.
3. Activate Jarad by paying 1 and sacrificing Cosmogoyf, causing each opponent to lose life equal to Cosmogoyf's power.