Earthbound Greater Linewalker

If you control a Synchro Monster(s) and have a Synchro Monster(s) in your GY: You can Special Summon this card from your hand. During your Main Phase: You can add 1 "Earthbound Immortal" monster from your Deck or GY to your hand. If an "Earthbound Immortal" monster is Normal Summoned while this monster is on the field: You can make your opponent's LP 3000. You can only use each effect of "Earthbound Greater Linewalker" once per turn.