If you have loads of burst mana and high impact threats then you will either do nothing or auto win
The other benefit of going this direction is that you are more focused on your ambitions of comboing the opponent out, and can build you deck with more synergies with this in mind
Most of my expensive Magic cards are either graded or in top loaders, but the rest are protected by my Dragon Shields
Generally Kira is not the creature they most want to kill and are forced into difficult choices, use two effects to kill the desired thing or use three to first deal with Kira
Sure, you may be playing a control deck that hopes to drag the game long enough to reach late game when your bombs become effectively unstoppable nukes, but if youre drawing nothing but tap Lands, then whats the use of it all
Its ability to create an all-color kavu, scale creatures with counters based on their colors, and recur multicolored cards from the graveyard makes it incredibly versatile