Devoted Combo chains Devoted Druid's untap ability with Vizier of Remedies to generate infinite mana; Pithing Needle names Devoted Druid to shut off its untap ability (which is not a mana ability), stopping that loop entirely. Nature's Claim answers Agatha's Soul Cauldron before it starts granting activated abilities to their creatures with +1/+1 counters. We make a small, surgical swap since this is fundamentally a race and we need our own engine pieces intact to combo as fast as they do.