In a deck where the goal is to power up Niv-Mizzet Reborn, rather than playing four of the best removal spell in the format, it's actually more beneficial to play some (slightly) weaker removal spells in different colors to maximize the power of Niv's enters-the-battlefield ability
3 Kaito, Bane of Nightmares Three Mana Planeswalkers Are Always Worth Considering Kaito, Bane of Nightmares arrives in a Standard with very few Ninja cards, but he might not need much help - simply putting him into play turn three with ninjutsu might be more than enough to steal a game
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That does not mean this is necessarily good, since the Ouroboroid effect is likely much better in an aggressive deck
In that sense, Belbes Portal is much more reliable, though you really only want to be using it with big creatures due to the mana investment required