Marrow-Gnawer is a typal commander, no doubt
However, the real power comes from the other ability, which costs X, and has you Tap Osgir to exile an Artifact with a mana value of X from your graveyard, and then you get to create two copies of that card
I talked last week about being mindful of using your enablers to maximize achieving delirium, but it largely boils down to paying attention, planning ahead, and being aware that not picking anything may very well be correct
Other than those, there are a few notable cards pricewise in the $5 department
Still, it has the same problem as all the Flares, and sacrificing a non-token creature is a real cost
How to Play Magic: The Gathering Setting Up Your Play Area How To Read A Magic Card Card Types Casting A Spell Starting a Game Taking Your Turn Tapping Combat The Stack Activated Abilities Triggered Abilities Counters Ending a Game Calendar and Events RELEASE DATES WPN IN-STORE PLAY EVENTS START SEPT 19th Sling webs and Thwip enemies, or is it the other way around