Korshem, Crossroad of Elements

Legendary Go again Whenever a hero reveals 1 or more cards, they choose 1; Gain , or gain 1♥, or their next attack this turn gains +1, or the next action card they defend with this turn gains +1. At the beginning of the end phase, if no hero has gained or ♥ from a card effect and no card or token controlled by a hero has had or increased this turn, destroy Korshem, Crossroads of the Elements.