The hero power is usable twice in those turns, where you are upgrading it (by upgrading your Tavern Tier).
Upgrading HP is a general good strategy in the early phases. Attack when using divine shield minions and more targets in levels 5 and 6.
Upgrading HP is a general good strategy in the early phases. Attack when using divine shield minions and more targets in levels 5 and 6.
Hero power CAN'T be used again after upgrading the tavern, other comment is wrong.