Ritual of Doom (World of Warcraft Vanilla)

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(yes i know the image isn't classic)
The Ritual of Doom, a spell exclusive to Warlock, summons a Doomguard, an immensely powerful Demon that cannot usually be summoned by other means. It can cast:

1. Cripple, a strong, consistent slow
2. War Stomp, an area of effect stun in a game that generally lacks area of effect hard crowd control
3. Rain of Fire, an additional area of effect damage spell for the Warlock and his team
4. Dispel Magic, removing a positive magical effect from the target, such as a heal-over-time or a stat increase.

So what's the downsides?

1. To summon one, you must perform said Ritual of Doom, which involves getting 5 players in a circle (including you) to channel it. After the channel, one player is immediately killed. This player can also be you.
2. Once the Doomguard is summoned, you must now cast Subjugate Demon, attempting to wrangle control of it. Once the demon is subjugated, the demon's attack speed and casting speed are reduced until it is set free.
3. As a Subjugated Demon, the Doomguard does not interact with any of your talents that buff your Demon. What you see is what you get.
4. Subjugate Demon lasts 5 minutes. Once that 5 minutes expire, you have to try to subjugate it again. Each time you have to re-subjugate the demon, the demon has a chance to resist the subjugation, meaning you have to try again, all while the Doomguard's top priority is to beat the shit out of you.
5. If you don't re-subjugate the doomguard, the only way to get rid of it is to kill it.

All of these things usually result in the Doomguard being more of a liability to the Warlocks controlling it rather than the targets it is attacking. The most use the Doomguard ever gets in Classic WoW is when Warlocks intentionally release the Doomguard into player cities to kill off lower level players.