Originally Posted by
apistat_commander
Baleful Strix seems pretty terrible against P-Fire. Planning on recurring Strix with Ruins against a deck packing 4 Wastelands is a pipe dream. You won't have the mana to do so or they will just waste your Ruins. Either way the advantage created by Strix isn't significant enough to warrant a sideboard slot. Why would you cut a Perish for Strix? Perish has a much higher potential for card advantage and does a lot more in the match ups where you want creature hate.
Strix also doesn't address the fundamental problem against Jund, which is that their deck is really well designed to grind out card advantage. If you want to beat Jund you either look at ways of disrupting their card advantage or creating your own. You want cards that are flexible and can function to stop their engines (Relic, Rest in Peace, Hydroblast, Celestial Purge) or create card advantage for yourself (Souls, Timely Reinforcement, sweepers, planeswalkers).