Template:Mal'Ganis strategy
Mal'Ganis is an extremely high-power minion with a very strong persistent effect that greatly benefits demon-based decks, but his high cost and relatively low Health makes him difficult to leave up without assistance. Protecting him is a must, so avoid playing him without any protection, such as Taunt minions. Save any Stealth granting mechanics (i.e. 
Finicky Cloakfield) for Mal'Ganis.
Mal'Ganis is even more impactful if he can be brought out earlier with cards like 
Voidcaller, 
Possessed Lackey, or 
Darkest Hour. Similarly, reviving him with 
Bloodreaver Gul'dan is a huge blessing because he will buff every other demon that's been resurrected with him.
Beware that your opponent may use take control effects such as 
Sylvanas Windrunner, or copy effects such as Faceless Manipulator, to make themselves the recipient of Mal'Ganis' abilities. Floating Watcher's effect cannot be activated while Mal'Ganis is rendering the hero Immune, making the two cards somewhat antagonistic.
Mal'Ganis is an excellent target for Carnivorous Cube, as not only will two 9/7 bodies be summoned upon the Cube's death, the two Mal'Ganis will buff each other, making them both 11/9s. This effect actually poses an impact as 9 health brings them out of the range of effects such as Crushing Hand, 
Crowd Roaster, 
Flame Lance, and 
Anomalus.
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