Huzzah! I am victorious! :)
Now I need to decide what on earth the next design goal will be... Hrm...
You know how Planeswalker were recently Compleated? Do that, but with Eldrazi instead of Phyrexians.
And don't feel like you need to stick to canon Walkers-if you have a nifty idea that doesn't fit any existing characters, just make up a new Walker!
Also, just gonna toss this out there as a bonus challenge... Omnath, Locus Of Annihilation. Sh, don't tell anyone! :P