Straight to the point: Currently it's possible to have an army of 24, using only tokens. You buy the 1:st level tokens, summon minions, then sell the token and buy 2:nd level tokens, summon minions, buy 3:rd level tokens, summon, sell, buy 4:th level tokens, summon. There you go, 8 minotaurs, 8 archers and 8 priests. The old minions do not disappear when you sell the token.
Working as intended? Specially at lower levels, this creates pretty big balance problems.