Its seen play in nearly every competitive format, was good in Standard and Pioneer, has seen some potential in Legacy alongside Buried Alive, and was a dominant force in Modern
Rakdos Reanimator with Zombify 4 Atraxa, Grand Unifier 4 Bitter Reunion 3 Bitter Triumph 4 Blackcleave Cliffs 4 Blazemire Verge 2 Cut Down 2 Duress 4 Fear of Missing Out 1 Fountainport 4 Koma, World-Eater 2 Mountain 3 Preacher of the Schism 2 Push // Pull 4 Raucous Theater 1 Restless Vents 2 Sulfurous Springs 4 Swamp 2 The Cruelty of Gix 3 The Elder Dragon War 1 Valgavoth, Terror Eater 4 Zombify 2 Abrade 3 Brotherhood's End 2 Duress 2 Ghost Vacuum 2 Molten Collapse 2 Sheoldred, the Apocalypse 2 Virtue of Persistence Another new take on Rakdos has emerged by exploiting around Zombify and Koma, World-Eater, two standout cards from Foundations
Why exactly do you, the Planeswalker, lose 4 life when your creature dies in werewolf form
Countering a blue spell or destroying a blue permanent is a tad situational, but its super effective when used against the right blue control deck