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Will probably grow a bit more desirable over time, but the vast majority wont imo

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

Even if you're only looking at Commander, this allows you to put a Sol Ring directly into play, but that's probably the tamest thing you can do with this thing

Blocker [On Play] [When Digivolving] [On Deletion] Delete all of your opponent's lowest level Digimon

And then there's Mattel Inc.'s HyperScan, a minor-league entry that seeks to carve a niche by combining a console with something else boys are known to like: collectible cards