This allows you to play less copies of spells and rest assured that they wont be milled
Although he usually appeared to have only a normal level of physical prowess, he had an "active state", where in his eyes would glow red and he would gain tremendous strength, agility, and reflexes
C Common Incoming Machine

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You dont cast that many non-creature spells to make an army from Saheelis passive alone, but she still serves her purpose well
It doesnt have as severe of a mana commitment as other Nivs, costing six mana but just one blue and one red and a bunch of generic mana, so it's much easier to slot into a multicolored deck