Links to Other Strategies Let's look at how this decision links up with drawing cards, playing lands, and other strategies
That's not to say Mortify's unplayable, just that there are cheaper ways to accomplish what this is doing, despite its flexibility

Top Rakdos Commanders Valgavoth, Harrower of Souls 29,214decks Kuja, Genome Sorcerer 19,867decks Deadpool, Trading Card 16,304decks Prosper, Tome-Bound 13,781decks Judith, Carnage Connoisseur 11,870decks Gev, Scaled Scorch 11,763decks Shadow the Hedgehog 10,945decks Ob Nixilis, Captive Kingpin 10,435decks The Infamous Cruelclaw 10,291decks Rakdos, Lord of Riots 10,001decks Rowan, Scion of War 8,971decks Strefan, Maurer Progenitor 7,913decks Kardur, Doomscourge 7,304decks Ozai, the Phoenix King 7,095decks The Lord of Pain 7,050decks Laughing Jasper Flint 6,967decks Evereth, Viceroy of Plunder 6,848decks Juri, Master of the Revue 6,699decks Magar of the Magic Strings 6,494decks Blim, Comedic Genius 5,749decks Anje Falkenrath 5,598decks Raphael, Fiendish Savior 5,417decks Rivaz of the Claw 5,413decks Rakdos, the Muscle 5,295decks Xantcha, Sleeper Agent 5,281decks Asmoranomardicadaistinaculdacar 5,223decks Grenzo, Dungeon Warden 5,146decks Imskir Iron-Eater 4,980decks Mogis, God of Slaughter 4,746decks Alesha, Who Laughs at Fate 4,694decks The Master, Multiplied 4,664decks Grub, Storied Matriarch 4,603decks Black Waltz No

In particular, the centering on modern cards is atrocious