You'd like to have a chance to play because you missed it? For me it's between the first summer event with Scathach as the welfare or Onigashima with Kintoki Rider welfare.
I haven't missed any events (day 1 player), but, both OG fate/zero and re-run happened when I was feeling lazy af, so, my Iri is still just NP3 and I definitely wouldn't mind getting two more copies.
Basically any and all welfare servant events I missed. Shiki, kintoki (damn I missed golden sumo), irisveil, Santa quetz, Santa salter...the list goes on.
