What it does
"Death Gigas" isn't an official Magic: The Gathering keyword or ability—it doesn't appear in the comprehensive rules or on any printed card. It may be a misremembered name, a fan-made term, or a card from another game entirely.
If you're thinking of a real mechanic, a few possibilities come to mind: "Undying" (a creature returns with a +1/+1 counter if it had none when it died), "Persist" (returns with a -1/-1 counter), or perhaps a specific legendary creature whose name you're half-recalling. There's also "Devotion" and various death-triggered abilities ("dies" triggers) that matter heavily in Commander for value engines and aristocrats decks.
If you can share the exact card name or where you saw "Death Gigas," I can give you a precise, rules-accurate breakdown of how it works and when it matters in EDH.
Iconic cards with Death Gigas
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