Boot Sequence saves a LOT of health in decks lacking good Relics to help with Turn 1, but can feel like a dead card if you do have a strong Turn 1 already. It's made a bit better by Hologram, which can let you get it back on later turns if it isn't used on Turn 1.
For when you absolutely, positively have to block on turn 1. Even better if you have bonus draw at combat start. Good target for Enchantments since you always get it at the start of fights.
