Apart from varying our converted mana costs to maximize our odds of hitting a creature with each Death's Oasis creature, the most important aspect of building around Death's Oasis is making sure we have ways to make our own creatures die for value
C: A playable commander card, not great, maybe you're running it because of budget reasons
Zahur shines in aggressive sacrifice decks that snowball once the engines start running
The faithful pony then accompanies Aragorn (then Strider) and the hobbits on their journey, then the Fellowship of the Ring from Rivendell to the gates of Moria, before being released back into the wild
Having it on a stick is greatif you dont need to sweep out the weenies, it can still swing, block, and sacrifice to deal an extra 2 to finish off a creature damaged by something else (perhaps from combat)
for an X/X implies that it will be 5/5