How do you train magic?

My intent was to train with slayer, but I’ve hit 70 slayer with no burst tasks. My understanding is I can really only burst dust devils and jellies right now, but Duradel doesn’t even assign jellies and dust devils have a 5 weighting so they are pretty rare. I have 72 mage want 77 so I can do my crafting. Any advice is appreciated.

Edit: I think from reading comments I’m gonna do this:

• kill dragons for bones (I need like 1k for 70 prayer)
• get morty hard diary
• spam barrows
• mix in afk alching
• do mm2 tunnels with runes from barrows if I get bored