4 Black CEDH staples under five euros (or 6 dollars)

With the talk about cEDH being an expensive format (it is), I wanted to do a series for each colour (Will also do colourless and land if I can, although will be difficult) showing off the staples that are relatively cheap to obtain.
The fourth colour of the series is Black, and I couldn't find an appropriate 5th card :(.
Any feedback is more than appreciated.

Nothing on this channel is financial advice.

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