Instead of having deadly creatures, your seemingly weenie spells become deadly
That was such a massive flop that Wizards chose to remove a similar set from the MTG release schedule entirely, even though it was ready to print, cramming the cards into Outlaws of Thunder Junction as a bonus sheet instead
On permanents, incubate can be an ETB, a triggered ability, or both like on Essence of Orthodoxy
Of course, going 1-2 more or less is still good but this should give you a baseline that all your decks should have
If the creature is on the battlefield as a creature, any text it has stating Enchanted creature gets is simply ignored
It helps keep some of the more unfair decks in check while not breaking the game at all