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Scales of Shale is a card I also think is very important for Black decks, as the lifegain is very relevant if you don't have access to cards that make food, and can very much turn the clock in your favor if you cast it on your 5/5 Mind Drill Assailant, for example

Granted, those decks are almost all focused on milling out the opponent but the original Hedron Crab is also able to target yourself, which makes it one of the most explosive and mana-efficient self-mill engines ever printed

MTG: Foundations Prerelease Pack: - Rules of Play says

Then the defending player guesses whether the mana value of that card is greater than the number of artifacts you control

Houndoom can then use its ability to search the newly-replenished deck for those Single Strike Energy cards

Essentially, setting up a Sweeper Pokemon means improving a Move that can help them wipe out multiple Pokemon at a time