While attacking with your creatures or using artifact abilities is certainly the most natural way to get them to maximize their token-making potential, you can also combine them with mechanics that give you additional ways to tap your creatures
Sacrifice fodder are the creatures you want to sacrifice
The new format, Willpower League, is intended to be played at large-scale events like PAX Unplugged, which runs from December 1-3 in Philadelphia, Pennsylvania, but also probably can be scaled down to fit local game stores if needed
Cards like Reassembling Skeleton, Pitiless Plunderer, and Phyrexian Reclamation keep the sacrifice engine running, letting you tutor multiple times per game
I had one time where devour came into play due to playing against a stax deck, but other than that, the small dragons really only count as blockers on their own, unless you have Scourge of Valkas or Dragon Tempest
It is extremely rare that even an Iconic card would fetch that amount of money, and the only recorded eBay sale for the card was much lower coming in at a more reasonable $570