So the other guy has stabilised and has a nice X cage set up, you feel like it's no longer possible to just stand in their way but you really, really, REALLY want that ball. And this time, just basing everyone and blizting a cage corner won't cut it. None of that PoSiTiOnInG. WHAT DO, FUMBBL? WHAT DO???

This is a list of the options you have, arranged from the most available to the least. Some are really unlikely, some are standard practice. See if you can spot an extra one somewhere.

Cagedive dodge!
There's no two ways about it: sometimes you just have to plunge at the ball carrier with reckless abandon.
Are you an elf? Good. Are you a two headed rat? Even better. Are you a break tackle big guy? Doable. Everyone else, start to pray.

Leap into it
The roll is marginally better than the dodge, and you get to choose where the ball will spill. Requires a skill or a prone stepping stone nearby.

Chainpush and Crowdpush
Maybe you have a frenzy guy or enough stunties to fill in the gaps. Maybe the cage has been setup a bit too close to a player that can be pushed into contact with it. Maybe there's trapdoors active! There's no exhaustive guide on how to exploit boxes and Ts, Malmir said a few interesting things in his stream with Bazakastine, but you'll just have to practice.

Wizard
Best inducement or bestest inducement?

Bomb, barrel or buddy?
Multiple stars can semi-reliably chuck stuff at a ball carrier or screening player. Protect your ranged weapon until they can be useful, as they're all kind of flimsy. Sometimes just them being on the pitch will have an effect on the game.
In a pinch, TTM and KTM can have similarly devastating effects on a tight cage, and technically every team can have some of it.

Ball and chain magnet (12 teams)
Not just for goblins. Can you push aside a cage corner? Time to stop moving the fanatic and to declare a blitz on the ball! Are you feeling greedy, or desperate? Maybe you can clear some more space or hit the carrier themself. Remember that almost every roll could be a turnover.

Gaze it away (10 teams)
Not just for vampires. Other undead teams can get two different gazing stars. Elf teams have access to the best gazing star in the game (and another situationally similar one - Kiroth!). Amazons and Lizardmen have some sort of gazing option on 3 of their stars. Just make sure you're not blocking your sacker's path with the gazing guy. It happens more often than you think.

Scyla rampage (5 teams)
Say you roll a one to activate, and a push on the first frenzy block allows you to get into contact with the ball carrier after the second frenzy block is resolved. Now you can declare a second block action against the ball carrier. Unlikely but not impossible.

Bilerot unpleasantness (4 teams)
He can Blitz a cage corner and then vomit (once per game option!) on the ball carrier. That's it. That's his entire deal. Movement 4 and no block so don't expect it to work very often.

Bite the bugger (4 teams)
Blitz a cage corner. Activate Kaptain Karina. If you fail Bloodlust, move into contact with the carrier. Enjoy the results.
Or in case that's difficult to pull off because of blocked paths etc, you can start with a Gaze from the Kaptain which could also be a bite, and both could open up the way for a Blitz on the ball.

Steal this ball (2 teams)
You need to chainpush a not-yet activated Boa (the snakeman star player) into contact with the carrier. This plan requires some level of "opponent's cooperation", so to speak.

The maul always gets through (2 teams)
You need to chainpush a not-yet activated Glotl Stop into contact with the carrier and hope to fail the activation roll. Probably works best with a prone Glotl Stop, as he'd need a 4+ activation to stand up.

Sp00keh spotted a missing one: Ivar's raiding party trick. Along with a couple clarifications and addenda. Good job!