That's because while some sagas have a very strong final ability, many dish out incremental value over time, and skipping right to the end of a saga means you miss out on lots of useful effects
Not only is it very strong and extremely flavorful, but has the potential to win games on its own
Some LGSs that run tournament casual Commander nights (which is a far better oxymoron than jumbo shrimp) restrict the number of proxies you can have to keep things fair, and Im sure there are pods that condone proxies under specific circumstances only
For our purposes, the spear can be thrown (javelins are okay), as long the weapon's general shape clearly implies spear
III Destroy all other permanents except for artifacts, lands, and Phyrexians
Need to jump into action with colorless ETB cards, we have a list for that