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13 Basic Lightning Energy

That card indeed exists, and it can be found in the Jurassic World Collection bonus sheet from The Lost Caverns of Ixalan

Playing Slivers in Commander is often mana intensive as you are usually in all five colors, so having creatures such as Gemhide and Manaweft Sliver are must-have inclusions when playing Slivers in Commander, as it allows you to cast your spells with ease

As the total damage threshold for commander damage is 21, its a lot easier, in many ways, to strap up one creature with buffs and evasive keywords in order to deal 21 over one or more turns than to deal 40 with a wider board

When you consider the average gameplay in Bracket 3 and below, though, you have to admit things are predicated predominantly on combat damage