So quick question about Surge Engine. How does it interact with Lazav, the Multifarious? If Lazav copies it and uses the first ability, does he retain the unblockable when he copies something else?
If you mean first activated ability, yes. The ability generates an ability-adding effect, which gives Lazav "This creature can't be blocked" and is layered on top of copiable effects like that of Lazav's second ability (C.R. 613.1, 613.1a, 613.1f). The ability also makes Lazav lose defender even if the object Lazav is a copy of normally has defender, because this ability-removing effect is likewise layered on top of copiable effects (C.R. 613.1, 613.1a, 613.1f).
See also:
- https://www.reddit.com/r/mtgrules/comments/q13ndt/conquerors_flail_interaction_question/
- https://www.reddit.com/r/mtgrules/comments/hx4qvg/lazav_the_multifarious/
- https://www.reddit.com/r/mtgrules/comments/is40sp/lazav_the_multifarious_tree_of_perdition_question/