The Wise and Powerful Wizard Merlin! - Season 8.1

So, you wanted to become the greatest wizard in all the land? Then come no further, for this guide shall teach you the ways of unlimited casting!

Rather than purchasing a starting item, I'd recommend immediately going for Book of Thoth to capitalize on magical power, as it will be critical for this build; and technically is for the majority of mages.

The next two items to get your CDR up quickly so that you can utilize your spells and escape will be Shoes of Focus, and Chronos' Pendant. Having this early CDR, as well as a lot of mp5 coming in will help you in teammates and giving pressure.

Following up after these items will be Gem of Isolation. This will benefit many of your spells by keeping the enemy in your AOEs, especially while in your frost stance, as your blizzard stacks with this slow.

If you've been snowballing through this and have become level 20, you should immediately get Bumba's Hammer. This is where the fun begins. Because of Bumba's unique property at this time, if you stay in your frost stance, you can cast your 2, basic attack, cast your 1, basic attack, and repeat this. Or just do your 1 and basic over and over again. And because of Isolation slowing down the enemy, they are fundamentally helpless. The other great thing is because you're constantly casting and shooting (and gaining HP back), this will allow your escape to come back quicker, allowing you to engage and disengage more often.

If you're still on the slow end of things but still have some gold, or after you get Bumba, your next item will be Polynomicon, since not only does it stack nicely with Merlin's passive, but since you're shooting your frostbolts 24/7, it's just constant non-stop damage.

If you're not dealing with healers, you can add Telkhine's Ring, just to add the cherry on top of your overwhelming arsenal.

That is all I have for this time. Until Bumba gets nerfed, I'd suggest utilizing this build until then. Happy casting!