This is the 1998 game by Digital Addiction, not to be confused with the 2011 game Sanctum by Coffee Stain Studios.
Always create a second group of soldiers on your second turn.
Look for spells that will hinder your opponent's movement so you can capture the neutral towns first.
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You can protect your soldiers from some spells by using forests as cover.
After playing a few games, look for cards that will let you splash in a third color of mana so you use a wider variety of spells.