The problem is that, as with searching for answers, if you play solo, you have to reveal everything yourself, so it is efficient to investigate the places you visit each time
I never find myself in a position where I want to take a turn off to cast it, and would much rather play a more niche effect like Shimmer Myr (cheaper, able to be flashed in and easier to recur) or Vernal Equinox, a card I mentioned last week when I talked about optimizing for fun
One black Wizard pinging opponents for every cast spell is going to annoy the table, but if you can amass a few of them, you'll become a problem
From shiny color palettes to cards you can only get through competitive means, these are the seven most valuable Kingambit cards in the Pokemon TCG
So it's understandable that infinite mana is incredibly powerful, especially in Commander
The card is ideal in older formats where there is an emphasis on lands and cheap spells, so expect to see the Vampire crop up in sideboards as a hate piece in Red