I noticed the overall Azurite Sea theme was woven throughout the decks rather than the individual decks having themes of their own
The good news is, it costs very little for you to pick up, and it gives you a reasonably efficient removal spell while also doing two to each opponent on any turn you play a planeswalker
If there was a powerful green background, it could easily outshine the other four colors players might consider
In a cube without combos Demonic Tutor is eminently fair
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I also don't imagine I would want more than one copy of a cheap burn spell main