It's at its best as a battle trick after blockers have been declared
Planeswalkers (18) 2 Karn, Scion of Urza 1 Teferi, Hero of Dominaria 4 Teferi, Time Raveler 3 Saheeli, Sublime Artificer 4 Narset, Parter of Veils 4 Sarkhan the Masterless Lands (25) Spells (17) Sideboard Planeswalkers (19) 4 Teferi, Hero of Dominaria 2 Dovin, Hand of Control 1 Liliana, Dreadhorde General 4 Teferi, Time Raveler 3 Kasmina, Enigmatic Mentor 4 Narset, Parter of Veils 1 Ugin, the Ineffable Lands (25) Spells (16) Players wont end up at the same place, though, at least not at first
#37 Nonono
This L-pattern can be found on any legit magic card
Bugenhagen, Wise Elder), and at least 2 more that care about power (Lifestream's Blessing)