Currently there are two best options for Threats Undetected: Najeela, the Blade-Blossom and Marwyn, the Nurturer
You can build a Voltron deck around this card, or go into the theft route too
And in the late game, its important to note that you dont have to add to your inkwell if you dont want to
Each deck consists of 100 cards, including a legendary creature known as the Commander
If an Adventure spell leaves the stack in any way other than resolving (most likely by being countered or by failing to resolve because its targets have all become illegal), that card won't be exiled and the spell's controller won't be able to cast it as a permanent later
Blue had flyers, which couldn't block shadow creatures, and green and red had non-shadow creatures which couldn't block shadow creatures or flyers