Once you have more information, your plan can adapt, but to start you just have to play to your strategy and to the odds that you are not playing against Shaman Tribal
But a twinkle of an idea glimmers in the deepest recesses of your brain
Even if it didnt pass the vanilla test everytime it was cast, it seems very plausible that a hard-to-combat knight that rewarded you for playing mono black would have been a force to be reckoned with at a time when creatures were not what they are today
Lets get into some decklists When it comes to well-established Pauper archetypes that make use of Ghostly Flicker, the most prevalent deck that comes to mind starts with a notoriously busted trio of land cards that you may already be familiar with: Yup, Urza Tron is a thing in Pauper and currently holds the title of being the most ubiquitous control deck in the format
Put a +1/+1 counter on it if its a creature and a loyalty counter on it if its a planeswalker
The Charmanders and Bulbasaurs that everyone could collect