SiegeStorm is a game of unending assault. You got cards, your enemy got cards. Between you and your enemy there are 2 tracks: one that your armies use to travel towards enemy, and a similar one where your enemy’s units travel to you. You both cast some creatures and spells. Cards are everything: your life bar, your mana, your library and so on. When you draw them into your hand you can either play them or discard them to pay for some more expensive, fancy card’s cost.
When you play a card, you can play it as an instant and get a trigger effect. Alternatively, you can play it as a creature on your track, then its passive ability will work. It will defend you at first, and once it moves up to the end of your track, it will be able to:
a) Activate (attack and trigger its effect)
b) Become your supporter (our fancy term for mana)
c) Or stay in the middle of the track and make its passive ability work all the time
So, you can build powerful combos, you can zombie-rush, you can build your economy and all sorts of other cool stuff. But whenever your enemy hits you, you will lose cards from your resources. You lose if you have no more cards to draw.