Sacrifice them to the Phyrexian Altar or the Krark-Clan Ironworks to generate more mana to make more robots
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Once again, Matt Tabak serves as our idyllic tutor for explaining both the old and the new in our Theros Beyond Death mechanics article
In other formats, paying some amount of life as an additional cost can be quite the drawback, Death's ShadowDeath's Shadow aside, but in EDH we have access to a lot of ways to turn this into an added benefit
Those strategies are cards that gain value from discarding (especially lands), cards that can allow you to play many lands, landfall, and cards with leaves the graveyard triggers