Iran always likes to talk big.

They said the same shit after Trump had Soleimani wiped out -- an offense much worse than killing a Hamas "guest" in the country.

They pussed out in 2020 in response to Soleimani's killing.

Of course, now Biden is in charge, so there's not much to fear from the US. But I don't think Iran is going to start an outright war with Israel. Probably just gonna funnel more $$ into Hamas or Hezbollah, and tell them to have at it.