You Haven't Impacted the Board In Magic , every action you take should generally meaningfully impact the hand or battlefield in some fashion
These will only appear in Collector Booster packs
Related reading Design-wise, Leader cards stand out: they have a red card back (instead of the standard blue back) and the word Leader printed above the characters name on the card
A couple of specific lands are going to help a lot too, most notably Cabal Coffers to make a lot of black mana, and Nykthos, Shrine to Nyx to use our high mana value (and resulting high devotion)
In your library, graveyard, and hand, a Room card has the combined mana value of both of its halves and both of its names
This creature, originally printed in Arabian Nights , was reprinted in Revised and Fourth Edition before fading into history