Played a couple of games with a friend who has bought into this. He had the starter set so we used the right tokens but, to be honest, you can do what us Magic players do and use whatever you have to hand. Dice, plastic gems, beads, Skittles, coins, anything would work as tokens.
Dice would probably work fine. A d10 would do for Amber count. d6’s would work for damage markers (probably use red). Another colour d6’s for the +1’s on your creatures. Finally some other way of marking stun (frankly just turning the creature 180° would do the trick). There, sorted!