Scavenger Crab

Usage and Strategy
Scavenger Crab is a good tool to bring back important cards after you played them. The card is mainly used on "win-condition" cards (i. e. cards that are used to win you the game/ cards that your deck is built around) or cards that profit from being played multiple times, for example Absolute Scaling.

If you play the card right after you play an action, you can ensure that you will bring back that action. If you play the card as first card on your initiative you will always get the top card of you library back. If you play the card on your opponents initiative however it is possible that your opponent uses an action to clear one or several of your units, which will then be brought back instead of the card you wanted to get.

History and Changes
Before the "Affinity Ticks" system was introduced on July 9th, Scavenger Crab only costed 1 extra mana off-affinity, which led to the card being played among a lot of different decks. Back then the card was mainly used to play the card Lucrative Expedition several times, which was indisputably overpowered before it got nerfed.