When a creature with both persist and undying dies, if it had no counters on it you decide the order in which both of the triggers resolve
As long as you're willing to pay the substantial inherent life toll that comes with Verrak, this commander can provide absurd amounts of value
A lot of the times, you will actually be sacrificing your creatures to trigger specific effects
As a result of all this, a new Jund-coloured Lands-in-Graveyard Legend is right up my alley
Adrix and Nev even enable a range of combos, including infinite token Deadeye Navigator loops, and instant wins with Biovisionary
Gold counterspells, provided they contained blue, where considered for the list and a couple were fairly close but didn't quite make it