
There could be Shards, Coins, Experience, & Territories.
Shards are the main thing used for summoning, without any shard cards, you are PWNED ( Come in 25's 50's 100's 200's 250's & 500's )
Spoiler: show
Coins are multipliers essentially (used to multiply the amount of shards given by one shard card of choice)
Spoiler: show
Experience
is used for bring Stronger cards into play
some cards require XP points to be summoned
Come in 5's 10's 15's 20's 25's (most needed to summon race cards will be 100)
Once spent count as used (Unlike shards which replenish every turn
Spoiler: show
I use this to make my cards http://bighugelabs.com/deck.php