Endgame Study #17: Sac it!

Hello everyone and welcome back to the 17th installment of Daily Endgame Studies! I hope you'll are enjoying them so far, and without further ado, here's today's puzzle:

Scroll down for hints

Small hint: Try to set up a mating net

Big hint: Look at the title of this blog post. Don't try to save that f7 pawn, go for more!