Untap, Upkeep, Attack with Skeletal Kathari. If no responses (aside from you gaining 1 with chalice), done.
With 1 card left in your hand, do you have a way to stop this or are you going to make me play this out?
Spidey: 24/16 then 17
Hand: 1
Battlefield:
(TU) Plains x2
(TUU) Island x3...