Or should I just use a trigger (if an enemy brings vulture to particular location, creation spider mine there??)
None.
http://www.staredit.net/topic/13823/You can also create mines and use the
stack trick to make it look like an enemy mined.
TheNitesWhoSay - Clan Aura -
githubReached the top of StarCraft theory crafting 2:12 AM CST, August 2nd, 2014.