Remember that valiant abilities trigger during opponents' turns as well, but only once each turn
The idea is that each set will have a specific card that will be the card that you want to pull, and a card with chase variants to look for
(Theres no way around that - its Mardus identity, after all)
But of course, just dropping a whole cycle of ubiquitous, meta-shifting power cards will always cause waves in any format (spoilers for the second half of this list!)
(In some uncommon cases, you might venture into the dungeon in response to the final room ability
Of course, if you do opt for Humans, then secret-Commander Winota is a powerful and fun card to build around