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Retrieved 21 August 2016

Vial Smasher deals damage equal to that spell's mana value to that player or a planeswalker that player controls

Last March of the Ents costs eight mana which is a big risk if it weren't uncounterable

It will continue to be whatever color or colors it was before Darksteel Mutation entered the battlefield

This means that there is a chance for players to potentially make their opponent unable to deal any damage at all, or simply very little, allowing Sylveon to continuously deal devastating damage in return

If sideboards were allowed, it certainly belongs there, but it does not belong in the main deck in my opinion