The truth is that Sacrifice isn't just the name of the game, it's the most important thing you do in the game. Sacrificing is more important than just killing an enemy. Sacrificing is the way that you truly reduce the size of your enemy's army while increasing the size of your own. Sacrifice is a game of strategy, fought by wizards.
Wizards have the power to summon a vast range of creatures and cast amazing spells.
To win at sacrifice it won't do to merely kill your enemy's minions. You must find a way to destroy the thing that allows the enemy to remain in the world in the first place - his Altar. This involves one form of sacrificing. I'll go into this in detail later. In any other strategy game if you kill a creature, it's gone forever.