Both of them do a good job of showing up the expansions new mechanics and key features, and after playing them I dont think a third one would have been necessary, especially because it would have just been another Ruby/Emerald like last time
Be reasonable
As for the other reprints, there are some good inclusions, such as Living Death, Mutilate, Caged Sun, and Dread Return
Theyre colourless, a callback to the nature of Eldrazi first explored through devoid back in the Zendikar block, as they transcend normal coloured mana
Suggestion #5: Make Use of the Library as a Resource The library is not as associated with the Phyrexians, but it was a resource that you tend to have more of, so it gave us additional flexibility in costing
Horde of Notions Horde of Notions was, for a long time, the best option for a 5-color elemental commander