The problem with many of these spells in Commander are the aforementioned increase in both player count and life totals, which drastically cuts the damage-to-life ratio
Heaven Sent Heaven Sent provides you with an infinite stream of card draw! over time at about three mana per card This is maybe more of a riff on How to Keep an Izzet Mage Busy than anything else, but this card has a lot of potential in any Cube that can take advantage of incidental artifacts and/or cares about casting historic spells
Abilities that care about modified creatures you control reward you for outfitting your squad
This card may not be the strongest choice for an elf commander, but it can fit well into the type-focused build
Also, and this is the main bit, you can exile it and the parts of Vecna to create an 8/8 Legendary Black Zombie God token with indestructible
This Vanellope would be a great fit in a deck like that, but I'm not suspecting it to be any good, at least not yet
