Get rid of something like Gaeas Cradle or Nykthos, Shrine to Nyx to make a lot of mana
A random common from an old set may still be worth very little, while a rare land, iconic spell, or Reserved List card from the same era could be worth a serious amount
There are eight MTG card types in total, each one representing a different aspect of the game
The tokens often feel rather cumbersome with so little focus on coven, despite the name, and are generally best replaced with other things, while other cards can probably just come out entirely
If your crew are killed in a Day of Judgment effect just tap in your precombat phase, make a 3/1, and crew up a vee that has a 3 or smaller crew requirement and swing