korean evolutions booster box Pokemon - Mega Evolutions- Mega Dream EX - m2a - The cards are in Korean and come from the popular Pokémon series Sword Korean Evolving Skies Booster Box

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

Of course, the pre-cons from this set have the Arcane Signet, so of course it'll make this list

Not only that, but if the opponent adds a card from their deck to their hand, Masked HERO Dark Law will randomly banish a card from their hand

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For reference, that meme has been used overseas for a long time