Youll play this in black lifegain/lifedrain decks either as a card or commander, and I can see weird games where all players get hurt once by Gollum at the beginning of the game and keep losing life in increments throughout
Its abilities move in a more aggressive direction than those of Prosper
PyroclasmPyroclasm is cheap already, why would you want to ditch a card for the privilege
(I should also mention that this doesn't include reprints, so fetch lands are counted as Zendikar cards, not Modern Horizons 2 cards, so they aren't skewing the data.) While Modern Horizons sets add a lot of interesting new cards to the Modern format, at this point, it's clear that they also add a lot of expensive cards into the Modern format, which in turn ends up increasing the cost of playing the format
its not a flat rate like most sites
There are two(ish) words that can inform you about just how good Vampiric Tutor is