Omnistone (how could it be usefull and troll)

It would be like summoner spell-book. 3 types. melee -ranged- support. choose at start of the game.

Type 1 melee: (Choose between Press-the Attack-hail of blades-Grasp-of undying,phase rush) Type 2 ranged: (Choose between Fleetwork-aftershock-comet-electrocute) Type 3 support: (Choose between Predator-guardian-summon aery- glacial)

Rules: /after you swap you need to swap all others to get the first one/ /cooldown between swaps is 4 minutes default by 6 time swapping cd reduce to 3 minutes/ /*after swap your keystone is not working 10 seconds after 6 swaps 4 seconds/ /you have no keystone before level 3 wave arrive/ /maybe not necessary/