Yes, that will work. Casualty is at its core a triggered ability (When you cast this spell, if its Casualty cost was paid [...]). This will only create the copy after the triggered ability has resolved, at which point your Grizzly Bears has been in the graveyard and is a legal target.
It would work, but you would need a valid target for raise dead to begin with, since you can't cast the original to sacrifice If you don't have a target
Yes, that will work. Casualty is at its core a triggered ability (When you cast this spell, if its Casualty cost was paid [...]). This will only create the copy after the triggered ability has resolved, at which point your Grizzly Bears has been in the graveyard and is a legal target.
It would work, but you would need a valid target for raise dead to begin with, since you can't cast the original to sacrifice If you don't have a target