Keyser wrote:
Cull says "loses 2 health". I believe that's different from damage, as creatures that can't take damage, such as Tortured Ghost and Vampiric Manticore, can lose health. This can be seen if you move a Ghost over water, if you use Essene Conduit on a creature that can't take damage, and if you cast Cull on a Ghost or Manti that's at two health or less (say, with a Creeping Gloom).
thank you keyser...
thats why i think the arcosaur-cull is a bug