1 Darksteel Citadel
There are several ways to recur an instant or sorcery from your graveyard, with Lier, Disciple of the Drowned being an example that shared the Standard spotlight with lessons
You are giving them 3 turns to find a solution or just kill you themselves
Enchantments come in two flavors: either they are attached to a creature, affecting only that one card, in which case they are called an Aura
The only difference between these cards and the Unlimited run is that the copyright date has been changed from 1999 to 1999-2000. The Unlimited and 4th Print runs are the most common, and the price difference between a 1st Edition and Unlimited card can be as much as several hundred dollars
Like with any deck youre playing, its important to let your table know its power level and, in the case of some taxing decks, that it can be super annoying