Bloodgift Demon is just an extra Phyrexian Arena, which is pretty great
Prava of the Steel Legion Prava of the Steel Legion provides a conditionally massive boost in toughness to your tokens, rivaled by Daru Warchief
Vedalken Shackles Im letting you in on some secret tech here, so dont say I never did anything for you
Grave Upheaval is great in the late game, bring back the best dead creature you can find, but none of that matters if you can't get to the late game because you're stuck on two lands
The Broken Sky's first ability applies to all creature tokens you control, not only the ones created by its other ability
Sea Gate Oracle The Oracle is a perfect filler card, it is far from overly powerful yet I play it lots because I feel it greatly reduces the element of chance in my games