Some players choose to play Last Will in order to increase the deck's ability to fill the field with monsters and swing in for lots of damage in a single turn
They were long shots, as they are some of the weirder ones, but who knows
The ability to bounce any of your blocked creatures back to your hand has several uses, letting you protect your Horrors and re-use their enters-the-battlefield effects
One odd note to both the Ikoria and Streets of New Capenna Triome-cycles are how they reference Plane-specific locations, something Wizards of the Coast often tries to avoid with powerful lands, as it makes reprints more difficult
Primeval Herald Well get at least two triggers off Primeval Herald, which is a good rate for four manacompare to Rangers Path or Skyshroud Claim
This means that all cards with madness are cast from exile , making the mechanic really good for that Prosper, Tome-Bound deck