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Most obviously, you can use Powerstones to cast artifact spells, like the retro version of Scrap Trawler from the Brothers War bonus sheet, which reads, Whenever Scrap Trawler or another artifact you control is put into a graveyard from the battlefield, return to your hand target artifact card in your graveyard with lesser mana value. Wait, lesser mana valuelesser mana value than WHAT

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You can tap it to remove a counter from another permanent and then populate, or tap and sacrifice a creature to proliferate

One final Homarid creature-type that ended up being redundant with the ones I spoke about up there is the Homarid Shaman, who is almost entirely a regular lobster if not for the cute little staff and tribal necklace that he's holding