@Boolerex fact is despite they are useful, they are rarely picken, both ice peashooter and ice cactus.
For the iron citron need something to replace the Bar Upgrade if you play something else beside Turf takeover. This upgrade is situational. He get that Bar Upgrade at elite lv5.
Every class usually get good things at elite 5, like damage, ice, fire upgrade, poison. Much better things..
