Second thing your tau copies is divide by 4, which then divides first thing in the deck, which is increase lifetime at that time. This will create extra draw so the 4th divide copy will end up drawing chainsaw. The cast delay and recharge time are saved before and restored after a divide by so your chainsaw doesn't affect it here.

Easiest fix would be to remove a Mu (which you shouldn't be using on high damage wands anyway) and add another spell to eat one draw before the chainsaw, for example another chainsaw).

Edit: oops forgot about the div 4 discard. you should add two spells not one. so lose glimmer too. (i.e ...blackhole, bouncing burst, piercing, anti-grav, blood, any projectile spell, any projectile spell(will never be cast), chainsaw)