Use Long Feng to put a +1/+1 counter on Persist Creature A, cancelling its -1/-1 counter
Build a 40-card deck and battle it out
Getting card draw when creatures die over the course of the game is already great, but its the -1 toughness that really gets this engine running
Where this card truly shines, though, is in Miirym, Sentinel Wyrm
Put those cards onto the battlefield, then shuffle
(Choose any number of permanents and/or players, then give each another counter of each kind already there.) If the last time counter is removed from a permanent with vanishing and the sacrifice ability is countered, that permanent will remain on the battlefield indefinitely with no time counters on it