While Leyline of the Void is on the battlefield, nontoken creatures your opponents control won't die
When you cast Bloodline Culling you can have a creature get -5/-5 until end of turn, which can be useful for killing off any specific threat, but especially those that are indestructible, as they dont die through normal means
Remember, every time people think they have the format figured out, they are surprised by innovation weeks later
I hope you found this guide helpful regardless of what version of Double Feature you end up playing
On top of that, it gives haste to your other creatures and can untap another target creature for unexpected plays
One of the downsides to this method is of course that you probably wont be able to contact a store if theyre not actually a Certified Hobby Shop