There are multiple cards that let you either gain lore, exert opponents, gain strength, or draw cards but only when an opponent has a damaged character
Tivit, Seller of Secrets Im not fond of Tivit, Seller of Secrets, but Im also not dense enough to pretend like this isnt the best commander with the word investigate in its rules text
But otherwise, every other scene card seems to be easy to come across however, some cards will be pricey, specifically the key ones like Saruman of Many Colours, Spiteful Banditry, and March of Lost Ents just to name a few
Boros Charm and Izzet Charm are both versatile and efficient
Troll, for example, can be an easy plant for a reanimator deck, putting itself in your graveyard and smoothing your mana in the process
Her unique deck of cards, which is automated by a short list of easy-to-understand rules, deals lots of damage and scoops up lore by the boatload