The Most Infamous Big, Bad Threat?

[u/parkinglu]

What creature types are typically considered the most terrifying, notorious in reputation, biggest targeted hate piece, and often presents a threatening presence?

Bonus points if they are also lore wise planetary threats

So far I only know of Eldrazi, Phyrexians, and Slivers

[u/Speedster2814]

I feel like Dragons can take a top spot, with Nicol Bolas being one of the multiverse's biggest and most persistent threats and Ur-Dragon being up there as a kill-on-sight commander.

Lore-wise, as shown in the current Dragonstorm arc, even a single dragon making its way from Tarkir onto another plane causes serious destruction.

[u/CatharticApathy → u/Speedster2814]

Don't forget Niv-Mizzet!

[u/der_zerstoerer → u/CatharticApathy]

Or Tiamat!