Heres a brief list of ways Ive used Renegade Rallier in the deck recently: Put a fetchland or Ghost Quarter back onto the battlefield (easy mode)
4 Neo Flamvell Lady An Effect Monster that helps you move resources to your Graveyard while banishing your opponents cards, Neo Flamvell Lady is an essential card for any Fire deck that needs Monsters in the Graveyard
Much of this comes down to how the game was designed in these early years: archetypes were less of a consideration when the anime was at its peak, with such ideas only really coming about later as the game evolved and became more strategic
And not in the hands of the 3D printing or software giants who own the competing platforms and exploit the designs for their own commercial interests
Both make Thopter Tokens for you, but Loyal Apprentice requires you to have your commander on the battlefield, where as Sai triggers off any artifact spell you cast, which means you can generate multiple in a turn
Other effects that interact with putting counters onto that creature will interact with this effect accordingly