One of my favorites is the Crypt Ghast thing, where you make all your lands tap for more than they should, or the Cabal Coffers thing, where you have some way of generating a bunch of mana using some specific combination of cards
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Giving your opponents mana, even at the cost of life, isnt exactly good, but it ensures a chaotic game
I've cast it quite a few times (albeit in highly flawed and experimental decks) and it always felt really good despite the fact that it was in decks that were kind of zany
We know how much kitchen table players love their graveyard as a second yard
Although the price tag makes it a limited option for many players, Traveling Chocobo will easily become a guaranteed staple for competitive EDH decks, adding to the list of Magic: The Gathering 's best possible commanders