They may or may not be the most powerful, because flavor matters
In the original artwork for Harmless Offering, it's a cat being offered up
(You may cast a spell for its web-slinging cost if you also return a tapped creature you control to its owners hand.) 4/4 Illustrated by Jack Kirby & Steve Ditko Standard Legal Alchemy Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
Finally, one of the big innovations of Lorwyn Eclipsed was the commingling of Lorwyn and Shadowmoor, which allowed us to mix mechanics from the two mini-blocks and create more mechanical space
This seems like an oversight, as Pod could be used in these decks to grab edict effects like Merciless ExecutionerMerciless Executioner or cards that pump up Kreshs power like Xenagos, God of RevelsXenagos, God of Revels, all while giving Kresh additional +1/+1 counters
At the beginning of the next end step, return each of them to the battlefield under its owner's control