Anytime another creature comes into play, you get to pick between adding three green mana, placing a +1/+1 counter on all creatures you control, or perhaps most importantly, scrying 2 and then drawing a card
This is asking a lot in 60-card formats
Consider that many current decks in Shards of Alara Block only have a handful of lands that can even come into play untapped, let alone basics
In a mono-black deck with access to cards like Cabal Coffers and Crypt Ghast, the value for X can be much greater
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No casts like Emry, no sacrifices like Daretti, just one free, but this is just once, not over and again like Emry, but you don't have to wait a turn to use to tap her
