They often rely on cheap flicker spells like Cloudshift and Blur as both value engines and win condition, so you can invest in other places
A good amount of times, your card draw will be an ability of a creature, enchantment, artifact, land, etc
My initial inclination was that it would be the worst-performing of the cycle of Hulks, but that was not the case
Its all upside for you, working on opponents life totals and making your creatures easier to cast
Then when you swing with Tanazir you can have the base power and toughness of everything that you control become your Elder Dragon's power and toughness, so without any additions to the guy you'll get 4/4 base and power to your team
If both are in play, you can potentially reduce the cost of any dragon you might play by four mana