There are even more in the full catalog, so I'd recommend digging in and seeing what other gems you can find for your decks
If you've actually drawn only one card that turn, you must choose that card and either pay 4 life or put it on top of your library
We carry both Play and Collector Boosters, Bundles, Commander Decks and all other supplemental products
There was quite a bit of discussion around Elesh Norn, Mother of Machines when she came out, too
With 99-card decks, redundancy in your card draw effects is key
Walking Ballista will almost never be the best card in your deck, but there will be games where its the exact card that you want to draw and it will always be at least a decent play