Smothering Tithe will ask each opponent to pay 2 mana whenver they draw a card, which is asking a lot in most games
A decomposing rat
Personally, I have a lot of faith in the card and try to use it very judiciously, and I dont mind letting another player get ahead early to draw the ire of the table
All this to say that once the TMNT is officially released, Jenova might become a deadly Commander for black-green decks that lean heavily on radical characters like Splinter, Shredder, and Michaelangelo
Whether through sacrificing creatures, self-milling, or discarding cards Graveyard decks often care about the number of cards in one's graveyard, and can often use recursion spells or even their commander, to easily access the cards within the graveyard
This is partially thanks to how well the cheap creatures available synergise with your big-spell theme, and partially thanks to how the mediocre removal hurts your chances of going long against green ramp players