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A galaxy foil rare (2%) or mythic rare (1%) borderless viewport land A textless singularity foil Sothera, the Supervoid appears in less than 1% of Collector Boosters 1 Art card or traditional foil double-sided token A traditional foil double-sided token appears in 65% of Collector Boosters

This deck has plenty of options, although it may need more work than others to become consistent

Legality depends on the tournament format -- Experience Card can be legal in some formats and banned or restricted in others

I can definitely see this commander occupying a similar space as Nymris, Oonas Trickster , offering you a way to maintain a healthy amount of cards in hand in a Dimir control shell

When summoning the Rock hydra you could, Put X +1/+1 counters (heads) on Hydra