Firkrag notably provides additional value for goading, as whenever a creature deals damage to one of your opponents, if it had to attack such as through a goading effect, you can put a +1/+1 counter on Firkrag, drawing a card in the process
Meanwhile, on Reddit, players report seeing listings of up to $18,000 elsewhere on the internet
Sword of Feast and Famine (Untap Artifact) As well as giving your creature +2/+2 and protection from black and green, [c]Sword of Feast and Famine[/c] also untaps all lands you control
Zuran Orb acts as a land sacrifice outlet, and it also provides lifegain
While it might be a cheap, quick and ongoing source of discard the return for your discard is far from worth it