Avacyn does cost a lot of mana to cast, so it'll take a bit to get enough mana to cast it, but once you do, it'll be hard to ever get rid of
This great Jeskai card even gives pseudo-prowess to all your creatures
Alliances , Deckmasters , and Coldsnap all feel very different despite having the same name and art
This is the ultimate Johnny Card, practically daring brewers to search for its hidden power, and simultaneously, its the ultimate joke card the one 90% of players will cite as the worst card possible. Its important to have a card like that in the game, and while it was no doubt a terrible feeling to pull this from your first Saviors of Kamigawa booster pack, Id like to think the cool factor of a Zen Koan in Magic card form justifies its existence
They differ a little among deckbuilders, but after studying many of them you can come to a general rate/estimate which I will present and explain further and I will add some personal advice/opinion on top of that
This card really captures the energy of Gengar, who is hiding just out of view from an urban explorer or ghost hunter