Elesh Norn is used in Legacy Reanimator and Dredge decks as well as Modern Gifts and EDH decks aplenty
Toss in the incidental edge against strategies like enchantress and artifice that are harder to interact with, and you have a winner
When you cast Bloodline Culling you can have a creature get -5/-5 until end of turn, which can be useful for killing off any specific threat, but especially those that are indestructible, as they dont die through normal means
2017-08-25 If you somehow control a Herald's Horn with no chosen creature type, no spells will cost less to cast, not even creature spells with no creature type
If the spell that's copied has an X whose value was determined as it was cast, the copy will have the same value of X
It's the Tainted Monkey!" Better yet, "Ach