You generally get a card thanks to haste, and it hits pretty hard
It's inkable, and the card can quest for one lore
It's already a 7/5 with trample and haste for six mana that gives you a free Jagged LightningJagged Lightning as a treat, but the lore continues to build after that
If we can keep Teferi off the board, Didn't Say Please and Thought Collapse allow us to play a weird control-mill game, where we try to stick a copy or two of Drowned Secrets, always leave up a counterspell for whatever threat our opponent might have (while hopefully using the rest of our mana to cast cheap mill cards during our turn), and slowly mill away our opponent's library as we counter their threats
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Relentless Assault variants tend to be win-more and they dont typically make their way into Cubes, but there are some Sacrifice synergies going on here with the morbid cost reduction and the +2/+2 and haste to give this card some wider applications