Like both of them, it's fully Standard-legal
Later on, as the Oathkeeper may get less useful due to opponents having more mana, he can be traded in to resurrect a planeswalker to the battlefield
On top of that, you can turn this into Enduring Scalelord or Worldgorger Dragon if you have the other pieces of the combo Alternative, an approach could be in a reanimation deck to fuel the graveyard, and you can get back Ancient Brass Dragon to (hopefully) bring it right back on the table (this not working with Teneb, the Harvester notably, due to the legend rule)
Spiteful Banditry
Let us know in the comments below or over in the Draftsim Discord
However, be cautious of scammers, especially when dealing with an unreputable buyer