"Junk Synchron" and "Dark Bug" are capable of Summoning each other and together meet this card's Summoning requirement. Three copies of each and "Dark Eruption" give the controller plenty of chances to Summon this card at the expense of only one card from their hand.
The Dark Synchro version of this card has a much more potent milling effect.
Increasing the attack target's ATK, or changing the original ATK of "Dark Diviner" so that it becomes lower than 2000, will result in more cards being milled.
"Grinder Golem" can be used to both summon a Level 1 monster to use for this card's Dark Synchro Summon and to give the opponent a high ATK monster to attack. Summoning it in Defense Position lets you dispose of it immediatly, while summoning it in Attack Position will let you attack it multiple times if you can manage the battle damage.