It can die quite easily to very cheap removal in the format, and it doesn't give you any sort of value up front
I would love to rate this higher, but so often, I see people basing attacks on life total, and actively being above starting makes you the punching bag
Any cards that Create lots of Tokens at a time can be extremely deadly for your opponents
(T+3) Extra turn 6, Tutor for Wheel of Fortune/Windfall, cast it, we all draw a new hand, then thanks to Kozilek you shuffle your graveyard into Library
There are infinite combos that outright win you the game, like with Walking Ballista, but Heliod can be a centerpiece of devotion decks, +1/+1 counters, lifegain decks, and enchantment-based decks
When purchasing high-value cards over hundreds of dollars, always buy Graded (PSA/BGS) or from trusted sellers