Summon effect

Some monsters have their summoning requirements or methods listed as their effect(s), such as with Gate Guardian or Cocoon of Evolution. This 'effect', is neither a Continuous Monster Effect, since it is only 'active' in the hand, nor is it an Ignition Monster Effect, since the 'effect' can be unlocked at theoretically any point in a Duel for most effects, bar a few that require specific monster(s) as Tribute(s), which can only be done in your Main Phase 1 or Main Phase 2.