We confirmed with game design architect Dave Humphreys that there is no limit to the number of additional combat phases, provided you can keep dealing chip damage to The Incredible Hulk as he is attacking
Reanimators: Anathemancer, Bloodsoaked Champion, Corpse Connoisseur, Hellspark Elemental, Hells Thunder, Mikaeus, the Unhallowed, Murderous Redcap, Puppeteer Clique, Rotting Rats, Scourge Devil Persist is really strong here, since Olivia can negate the -1/-1 counter those creatures get after dying
Not only for finding the right lines, but also to be able to find those lines in a reasonable amount of time
(on a huge creature with trample, for example) I know some players would say Pariah's Shield is a better play as it's harder to remove and that is true but it costs more and that is the only reason I'm not using it
Youll still curse under your breath every time your opponent casts the second spell on their turn, but its not as bad