Whenever a creature dies, if it had power greater than Drizzt's power, put a number of +1/+1 counters on Drizzt equal to the difference
The Rummaging Goblin has never technically given Jenny card advantage, it's simply changed her old cards into new cards
The same is true if you choose the second and third modes and destroying the enchantment ends such an effect
We still haven't found it
Transforming Etali, Primal Conqueror is mostly a last resort though, because why would you not want to keep casting Etali, Primal Conqueror to play all of your opponents' decks
Theres still another week and a half to turn things around, of course, but theres a real chance that Magics first Standard-legal UB set is marred by lopsided representation