Basically a single-target and repeatable Fog, I can see Singing Tree being a great lock-down card back in 1993 when folks usually only had one threatening creature at a time, and it was only a threat because it could deal combat damage
You can also find me streaming budget Commander with the Scrap Trawlers every Sunday at 7:30PM Central on twitch.tv/scraptrawlers, or find our uploads on YouTube
However, Shimmer Dragon could still see play in the right artifact-heavy deck looking for a resilient finisher with card advantage
Do you prefer the idea of stretching out the game and creating a snooze-fest using a bulky Snorlax until your opponent has no more cards to draw
More card draw triggers, please
The importance of this cannot be overstated, as instant speed boardwipes can be cast in the best way to make rebuilding awkward for opponents and easier for the player casting them