While Ulvenwald Tracker is great at hitting other people's dorks and value creatures like labman or bob. The use was mostly limited towards 1 person and 1 creature a turn as spending untaps on it is very recourse intensive towards only one goal...

A new Null rod/Stony Silence in creature form is always a welcoming thing as it can possibly also generate Derevi triggers, is easier to tutor for And Yisan will produce it at verse 2.

(Take for example Rip helm combo; the turn it enters it can 90% of the time only get one player hence why no one plays it anymore and better stuff exists! Although with Ulvenwald, it's still playable in dork heavy meta the other isn't playable at all!)