Is it powerful enough
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
Given the high demand from players for this powerful combination, its a card with strong potential to increase in price depending on environment
When Garruk Relentless has two or fewer loyalty counters on him, transform him.0: Garruk Relentless deals 3 damage to target creature