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Postie is a longtime MTG fan, having appeared in many YouTube videos playing Commander, and is known for attending events whenever his schedule allows

If your deck cares about the graveyard at all, you ought to consider one or two of these effects

As you can tell from the Twitter post (assuming that you can read Japanese), this is meant as an incentive for Japanese audiences, so no point chasing after these in your English Collector Booster boxes

(1) When another card, or another cards effect, is activated on the field (Quick Effect): You can Set 1 Artifact monster directly from your hand or Deck in your Spell & Trap Zone as a Spell Card, but destroy it during your opponents next End Phase