Tourach, Dread Cantor Hymn to Tourach is an insane card to run in black decks, and having access to a creature with the same effect is absolutely amazing, despite the extra mana investment you have to pay to kick Tourach, Dread Cantor
While it doesnt have the upside of being a creature, it can act as an instant-speed way to refill our hand in response to a removal spell or board wipe
These are do nothing cards on their own and so have to put in that bit more work to be worth running when compared to a card like Yahenni
Being able to ramp when it attacks or enters the battlefield is a powerful effect, especially in formats with access to fetch lands
The same goes for the token tray
His ability can only be used once, but once is all you need when youre going to haste and trample up a monster and attack for lethal