Hand of the puppeteer: unique glove.
when you or a minion kills an enemy it has 5% chance to resurect as a puppet.
100% increase minion damage
100% increase minion health
1 max rare, 2 max magic, 3 max normal puppets
+1 to all minion skills.
would go infinite with auto sacrifice 
(probably thats why u chose low 5%) but with enough enemies around…easy infinite combo 
though i like the over all idea. But since Minions got huge buffed in 1.3 I think this will have to wait long time
Anything that interacts with enemies and/or their corpses is technically very difficult to implement and the devs said multiple times they tried it internally a couple of times but it is really hard.
So I don’t think this will come anytime soon.
That’s easily fixable by adding “Can only trigger once every 20s” or something like that.
But you do realize that there are already uniques that provide infinite sacrifices? The historical catalyst will keep summoning a minion, the t-rex will keep respawning, etc.