This ability triggers at the beginning of your upkeep regardless of the number of types in your graveyard, and it checks that number as it resolves to determine whether you lose 4 life or not
Nightbound (If a player casts at least two spells during their own turn, it becomes day next turn.) Illustrated by Marta Nael Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
Pairing this with characters like Aurora, Dreaming Guardian will create an even stronger combination that adds Ward
That leads me to a specific anecdote, which is that the only instance of what could be called grinding I had to do in the game involved fighting some guy in a lab to get Water Energy cards in order to build a specific setup
The Vintage Super League was delayed due to players pulling out
A lot of folks will lean into cards like Lightning Greaves or Swiftfoot Boots when they run him onto to reduce that, but those (and he) are still very answerable