Does Impale work on landmark minions?

Can Creeping Vines spires use their Creep talent to move onto Source wells?

Can Dywen use Pacify on a unit with Engage?

Can units that were summoned through the Summon or Evoke talent attack on the turn they were summoned?

Can you have more than one unit from basic form on the same hero?

Do upgrades removed from the Root Die have to come from the bottom of the spires?