They require you to go five turns without taking damage (or proliferate their filibuster counters), but there are many ways in blue and white that can keep you clear from danger, like Magus of the Moat, fogs, and Ghostly Prison effects
Kagemusha of the Blue Flame
Youll need some support to make this card connect, though, so be on the lookout for goblin lords
On the surface, the box looks okay, but not sure about the blurry country codes on the bottom of the box
One thing that the Cavalry has over Craterhoof, at least in a vacuum of single color identity, is that White does get a smattering of blink and flicker effects, making this card far less survivable in the long term if it can be used again and again