Doom slayer, Hell's downfall

Haste, menace, double strike

All devils, imps and demons must block doom slayer if possible, when doom slayer is blocked if they are a devil, imp, or demon send them to exile otherwise send them to their owners graveyard

If a opponent is attacking you with a devil or demon doom slayer gains first strike and reach until end of turn

When a devil, imp, or demon dies while doom slayer is in the graveyard return doom slayer to the battlefield tapped and attacking