Cast on block with Svalinn Passive Tree Idea

https://maxroll.gg/poe2/passive-tree/9q7l00vd

i was wondering how it would to have svalinn to cast on block to trigger either comet or lightning conduit. If lightning conduit you can use lightning warp + ball lightning to create shocked ground and can use it to cull enemies as well.

You can also use the Alkem Eira, Blazon crest shield which states that "all blocked damage is recovered as mana", and combine it with the "Mind over Matter" node, which states that "all received damage is taken by mana before life", but you must remove the "Blood Magic" point. Also, use the "Anvil amulet" to have 5 max block.