While its too early to know for sure, Id say its quite likely
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Heres how the combo works: Step 1: Have both Saheeli and the felidar in play simultaneously
It wouldnt be a playable format if we couldnt pay 1 red to blast something for 3 damage (my condolences to the three of you playing Standard in the year of our Lord 2025)
Just like with Magus, decks that rely on lots of non-basic Lands like Amulet Titan can struggle in the face of Harbinger