Well, when Multani dies, instead of putting it in your command zone, you can let it go to the graveyard and use its activated ability to bring it back to your hand
Thats basically turning your whole tribe into instant attackers, which is how you steal games before opponents can stabilize
As such, it lends itself very well to deck upgrades, but even if you forgo upgrading it, Limit Break is still a great deck to play with out of the box without any alterations
It also is a free way to discard a land, letting cards that can bring them back to your hand or even straight to the battlefield, like Restore, turn your discarded land into an extra land drop for the turn
like what did it mean for design, exactly