Necromancy
Necromancy does not sacrifice itself like it should when cast by Infamous Cruelclaw. Infamous Cruelclaw has an alternate casting cost that happens during the damage step of combat. Necromancy should sacrifice itself if it was cast at any time a sorcery couldn't be cast. Any point during combat meets that requirement. However Necromancy fails to sacrifice itself come cleanup step.
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SPAtomsk#42661
commented
The sacrifice occurs only if you cast it using its own ability. If you cast it using some other effect (for example, if another effect allowed you to cast it as though it had flash), then it won't be sacrificed.