In fact, the Phelddagrif's three abilities all give your opponent some benefit in some way
After playing as many as you care to, you can find a Dream Stalker in order to bounce your Recruiter
Red and green are the best, and for red, the reasons include cards weve already mentioned: Dockside Extortionist and Jeskas Will, but also Mana Geyser
Korvold, Gleeful Glutton initial casting cost of Korvold and his Commander Tax can be shaved down by sacrificing your permanents
Three mana to grab two lands out the deck is fine, but the ability to drop lands in as a catch-up, Burgeoning effect is what takes it higher
Functioning atypically to a board wipe, however, after all creatures are destroyed, you select one creature from any graveyard and put it onto the battlefield under your control