Jace, the Mind Sculptor Jace, the Mind Sculptor is one of the most iconic blue cards in Magic: The Gathering, being the first planeswalker banned from Standard due to its powerful ability to manipulate not only your library but also your opponents
Umbra armor (If enchanted creature would be destroyed, instead remove all damage from it and destroy this Aura.) Umbra armor's effect is mandatory
It's unclear whether this was the most necessary of the Slivers, but it was the one that frustrated the most opposing plans to deal with the problem and even opened up new game plans when the card advantage resulting from saving your creatures could allow Sliver decks to go the control route when backed up by counters and removal spells
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Its easy to build, fun to play, and provides a high level of power despite a simple game plan
Preventing your opponents from interacting with your game plan is a huge advantage