We’ve always used kerosene-soaked sawdust. With it, tent, log cabin... doesn’t matter, the sawdust burns long enough to light any stack.
Pieces of rubber tire work really well, too. Used to use them for burning brush piles in the rain and snow. Get them burning well and just start throwing brush and sticks on; once you got enough wood burning it would dry out and ignite any wood you added, no matter how wet.