Any player may respond to Seraph of New Phyrexia's triggered ability, but once that ability starts to resolve, no player may take any actions between you deciding to sacrifice another creature or artifact and Seraph of New Phyrexia getting +2/+1
It costs two mana to cast, zero to equip, and gives a creature haste and shroud
Two mana is incredibly cheap for an effect like this, and the lack of any kind of once per turn limit makes Sram a serious powerhouse in the right deck
Prosper, from the accompanying Commander decks, is an interesting case, because it is the first time they tried to find synergies for the mechanic
It works similar to legendary in how it can apply to several different card types permanents and nonpermanents
Many days later, finishing the drive and continuing to sink hours into the game, I wanted to share a piece of the game with my family