Diabolic Intent is definitely not for every deck, but if you play a lot of efficient creatures or find that your playgroup is prone to board states that stall out leaving everyone looking for answers, consider giving this card a chance to break the ice and propel you to victory
If there is one tribe where I am willing to separate my expectations of any future developments of it from the dozen cards we have thus far, Ninjas would be it
Serum Visions is the premier cantrip of the Modern format, it's the glue that holds many blue decks together
Exile the top card of your library until you exile a non-land spell with a lower mana cost than the original card with Cascade
This two-mana aura protects pretty much any creature of your choice, and as its not only a good card, but one of a kind too, its only natural itd see some spikes here and there
That said, considering the cards $7 secondary market value, Cavalier of Dawn is actually a decent reprint