Because the land enters tapped, Vibrant Cityscape is best used early, before tempo matters, or late , when triggering landfall becomes the priority.
You do want to ensure you dump at least two big things out with it however and so it will put some build constraints on your list should you wish to use it
Because of this Alexi was one of the most highly coveted bombs in a format lacking in bombs
#17 I feel like espeon is not weak at all, forcing your opponent to re-search all of their evolved Pokmon is pretty impactful especially against pidgeot reliant decks or ones that use mid-stage evolutions such as kirlia or drak as draw engines
Removal Mono-black has a lot of great targeted removal options
Fire Fist synergizes with your Leaders cost-reduction effect, letting you KO two Characters one with 5,000 Power or less and another with 4,000 Power or less