While it can take a bit of work to make a burn theme work in an Aegar deck, the extra card draw is hard to pass up, especially in an archetype that can sometimes struggle to provide it
For a low Energy cost, its attack deals 80 damage while revealing the opponent's entire hand and discarding a chosen Supporter card
It might be fine to only play with four or five sources of black mana in your deck
I have no doubt that with Force of Negation to slow down early decks by countering Aether Vial, Faithless Looting, Ancient Stirrings, and the like, Modern will be a more hospitable environment for decks with eight or more cards that cost four or more mana
Infinite Loops Engaged Scurry Oak + Rosie Cotton | Confectioner + Peregrin Took
Since she counts herself with her cost reduction, that can be a minimum of two mana for using it with a power of four or more