There are a lot more suitable filler cards from red than from blue, your blue stuff tends to be very powerful or very cheap
If we're looking to have our first spell each turn be big, and we're also looking to have a big creature enter the battlefield and turn that creature generate mana through Alena, Purphoros, Bronze Blooded is a natural fit
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The artifact removal is less commonly called upon but frequently life saving
Sac outlets in general make good use of black fodder, but Flare of Malice specifically demands a nontoken black creature to cast it for free