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

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

Can Dywen use Pacify on a unit with Engage?

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

Does the Orgegrowth's Challenge talent prevent opposing units within its effect range from using instead of attacking talents like Weak-point from the hammer and chisel equipment?