The default for most Cube designers is that a cube should be singleton, but some favor breaking singleton if the design so requires
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You can use an Energy card on any Pokmon, either on the bench or on your active Pokmon
The DCI, as google tells me, is the governing body behind things like banned cards, restricted cards and the way that the competitive gameplay is governed, and the artwork (done by Maro?) is just a scribbled dude in a blindfold holding a mug of beer tossing darts at cards on a dartboard as a self-deprecating way to show off the "rigorous decision-making process" that the DCI uses to ban a card
We also have Territory CullerTerritory Culler, which can get more Eldrazi to our hand when we drop lands, and From BeyondFrom Beyond, which can make Scions and be sacrificed to search for an Eldrazi
A deck that focuses on graveyard recursion and land-based strategies would benefit from including Six in their lineup, as it provides a steady stream of land cards and enables the reuse of nonland permanents with retrace