Too costly. Even if you're playing it on an opponents turn. When you're focused on getting out a Cloudscraper turn 3, and pounding your opponent with Overwhelming Stampede. It just has no place in this deck. Might be useful in multiplayer because it has Storm, but besides that. I don't see any use for it at all.
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I'll most likely be taking out the Calvary for another Exemplar. Calvary is only in there because it's shiny.
I'll be adding them once I find them. Zendikar wasn't very popular around where I am.