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Actually drawing Living End is a problem for the deck, so he plays more cards because he doesn't want to draw the most important card

If you had them stuck in your hand, you could Body Snatcher one down, but otherwise, would have to either play them or make yourself discard them (which involved a lot more work)

Any card with cascade also exiles cards individually, turning The War Doctor into a literal bomb on the battlefield

So, you'll get to draw everything you mill over as well, eventually

No card today would use an effect like this

The Scion is very powerful and Spike-y at the kitchen table and should find a big following in Commander and I wouldn't be surprised if it winds up with north of 1,000 decks registered over at EDHREC.com