These bloodsuckers have been mainstays in both casual and competitive play for years, giving players some of the most synergistic and aggressive gameplay loops in the game
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But the real gem lies in the two included cards, celebrating the Wano arc:
Your best win condition is to stick an Unholy Annex and simply run them out of resources, but it won't be easy to keep a Demon in play (and if you do, you just win anyway) so preserving your life total is critical
It takes time to learn how to differentiate between real and fake holofoil patterns, but a good way is to look up actual photos of holo foil cards online to make an educated comparison
At the time mill decks tended to be mono-blue or white-blue and were all about controlling the environment, using milling as a win condition once control was established