User blog comment:KodachiZero/Why Trading is Bad/@comment-24927152-20141206210357

What about only evolution and free units (not from events or starters) trading? (Totems, pots, idols, nymphs, spirits, ghosts, kings, gods, and crystals) and you can only trade for those kinds of units/ask for them, then on top of that, there'd be a 5 offers/trade limit per day, so it couldnt be overdone/overused?