While not explicitly lifegain, I think this commander offers a fresh take on the lifegain theme and directly converts your lifegain into a tangible resource (mana) as opposed to more +1/+1 counters or bonus life
FINAL FANTASY XIV, for those who don't play the game, has such a dedicated and vibrant culture of active players and an extremely welcoming community as part of my new-player experience
This archetype plays defense better than its more aggressive red-white counterpart, making it more of a midrange deck that can shift gears as needed
Plus, every Unova creature got an Illustration Rare or Special Illustration Rare between the two sets, which got collectors super hyped
First, she could cause all players to discard a card, great in Black, which frequently interacts with the graveyard anyway
You can also make use of your indestructible lands, Darksteel equipment, and more