Claw

Claw is an incredibly divisive card among the community. It has the potential to scale extremely well, but before scaling is relatively unimpressive. Effects that allow you to play claw multiple times, such as hologram, reboot and all for one, can help to scale claw quickly before fights become overwhelming. Even when not trying to draught claw as a win condition, it is normally alright to pick one copy up early as a 0 cost card when you typically don't have any form of energy gain in act 1. Although it scales extremely slowly on its own, it can provide significant DPS in long boss battles, especially in skill heavy decks. Claw decks often run hello world because it can generate additional claws.