i had a combo i made up but its good, (not too goood but it makes alot o creatures)
Lifeline,
Junkdiver, (have at least 2 in deck, 1 in hand 1 in play)
Monkey Cage,
Golbin welder
(doesnt have 2 be in same turn that u get them out in the order) First you have golbin welder, and lifeline out, and a junkyard diver, then you play monkey cage. after you play monkey cage, you play junkyard diver... monkey cage is saced and you get some creatures... then you use golblin welder to switch junk diver w/ monkey cage (helps out more if you have an artifact in graveyard while monkey cage was...let say pyrexion colloses) junk yard diver and golbin welders ability combine to bring back 2 artifacts fro graveyard, then you bring back collosis in play, along w/ the monkey cage, (but monkey cage before collosis if you can), then monkey cage is sacrificed again to the graveyard b/c closisus came into play, and you get more creatures... if u have something that can untap the golblin welder, or you have another welder (or wait till next turn), then you can use its ability again to let say sacrifice colisus to bring back monkey cage, then if u have a 3rd or another creature to untap, (or u just wait till next turn), then you sacrifice junk (w/ wleders aility) diver to bring back collosis, and you get more creatures from monkey cage when its sacrificed...
ANOTHER WAY: lets say you have a creaure for ex: pyrexian collosus alrdy in graveyard,and lifeline & monkey cage is out, lifeline will at end of turn bring collosues to play, which sacrifices monkey cage and bring you your collosues, with a bunch of creatures that you get from the monkey cage... if this is confusing read each card... (excpet pyrexian collosis, its jsut an 8/8 that costs 8 that i would only use to sacrifice and summon more creatures form this monkey cage/welde/r diver combo)