Because the land enters tapped, Vibrant Cityscape is best used early, before tempo matters, or late , when triggering landfall becomes the priority.
Notably, while this covers almost everything we saw in the debut stream for The Lost Caverns of Ixalan spoiler season, its not everything
The cheaper equip cost versus Swiftfoot Boots makes the Greaves favorable in almost every situation, minus the ones where you need to target your commander with a lot of spells think aura and equipment-based Voltron decks but even then you can always move the Greaves over to another creature at sorcery speed
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Entering the battlefield as a 4/5 Dragon, it costs 2 green and 5 generic and has the following abilities: Flying When Foe-Razer Regent enters the battlefield, you may have it fight target creature you dont control