My primary criteria for group slug cards is simple: I need permanent cards that give you a steady advantage, preferably when your opponents do something to maximize the value, but many of them simply trigger on your upkeep, end step, and so on
If a face-up Machine monster(s) you control is destroyed by battle or card effect: You can target 1 Machine monster in your GY
Force of Will Honourable mentions Foil Thwart Muddle the Mixture Miscalculation Mindbreak Trap Disrupt Izzet Charm Dimir Charm Voidslime Absorb Voidslime Absorb I always feel very guilty leaving out cool and powerful cards from a list such as this and feel obliged to at least mention those that were also considered
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Remember, though: your own cards will bite it too, so timing is everything
You wont get all of them, but youll always end up with something