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I don't knew Kalastria but I think is pretty good in a shardless aget version of the deck... you can cast Kalistra with shardless for a easy combo.
Kalistra is good when opponent play Leyline of...

I also play Imperial version, my current version is this:

4 aluren
1 biblioteca silvestre
4 brainstorm
4 cabal therapy
2 thoughtseize
3 abrupt decay

4 imperial recruiter