You cant really go wrong, as such, but consider ease of casting and the density of power three or four creatures, and then density of token production
The card is a direct answer to the draw-go meta, as the spell itself cannot be countered and it grants that same uncounterable protection to every other spell you control
This means you get the best card out of three, but you also get the best cards out of your hand minus the two worst ones
If you haven't sacrificed any permanents during your turn by the time your end step begins, Sawblade Skinripper's last ability won't trigger at all
To make my list a card must be good in general kitchen table play like multiplayer, Commander, Five Color, Type Four, Highlander, and more
But people pretty much have to block, making this a rough choice