Then the -2, which can be done twice with the starting loyalty of five, will make two 1/1 Nightmare tokens that will grow with +1/+1 counters permanently if you exiled a card this turn
In the case of a cast-from-exile strategy (yes, Im talking about Prosper, Tome-Bound once again, bear with me) you have tons of possible cards, especially in red
For only two mana, it lets you search your deck for any card and put it directly into your hand, giving unmatched consistency in Commander and other formats
The exact number of lands thats right for your deck youll figure out through playtesting
Have a dedicated space for (unsorted) cards I have an empty fat pack with some empty sleeve boxes inside, at a fixed position on my desk, where I store cards that are waiting to be moved into the collection