Spend that mana to untap Puresight Merrow and say yes to removing the top of your library from the game
This is about as bad as it gets in terms of payment model, except for situations where you couldnt do anything for free
In this deck in particular, I recommend leaning heavily on creature-based ramp so we can take advantage of creature synergies: abilities like Duskwatch Recruiter, Domri Rade, and Lurking Predators become much more consistent card advantage if we have a high creature count
It might get interesting in Temur control as well, where it could support a strategy of ramping into threats while keeping the board under control
The utility of being able to use this as a (sorcery-speed) pump spell in addition to the fight mechanic was extremely valuable to those decks at the time, which were full of cards like Questing Beast, Lovestruck Beast, Gemrazer, Kazandu Mammoth and other beefy creatures that benefited heavily from fighting