If you need a general board wipe later in the game, cast Earth and put enough mana into the X cost to make it happen
In effect, this means players are bidding on the number of troops they are willing to sacrifice to potentially win a province
Along similar lines, the card is definitely worse in sideboarded games where most decks are more likely to draw that key piece of interaction, and the more copies of Unsubstantiate you play, the harder it is to sideboard them out when you decide theyre bad against your opponents post-sideboard configuration
So, what do you think of my analysis
Surge foil versions of these cards appear only in Collector Boosters
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