What it does
"Arcane Life-support" isn't a standard Magic keyword or ability—it doesn't appear in the comprehensive rules or on any official card. It's likely a misremembered or homebrew term, possibly confused with "Arcane" (a spell subtype on Kamigawa instants and sorceries that interacts with Splice) or with cards that protect your life total.
If you're thinking of effects that prevent you from losing the game, look at cards like Platinum Angel, Angel's Grace, Phyrexian Unlife, or Gideon of the Trials' emblem. These set up "you can't lose the game" or "your life total can't change" conditions, which matter enormously in Commander where commander damage, big life swings, and alternate win conditions are common.
If you saw "Arcane Life-support" on a specific card or custom set, double-check the exact wording—it may be a typo, a fan card, or a card from a non-official product.
Iconic cards with Arcane Life-support
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