As it resolves, you copy that spell
Dangerous because it has trample and can get kind of large, plus you know youre not playing it in a deck without planeswalkers
The reason for its recent climb in price is pretty simple, it's the perfect inclusion for popular Wilds of Eldraine MTG commander, Eriette of the Charmed Apple
My only criticism is it feels like Cleopatra was originally designed to trigger when historic permanents died, to keep theme with the rest of the set, but then they realized drawing three or more cards off of every dying Saga would be way too strong
Am I playing out Equipment at a variety of costs between two and five
Similar to Walking Ballista, Marketback Walker enters with counters equal to half the mana you pour into it and can gain additional counters for four mana