I run a hardcore tank WD using rain of toads, and it works great!
Your damage will obviously be lower using rain of toads, particularly on a tanky, hardcore version, but it kill plenty fast up to MP2 or 3, and is extremely safe.
LoH is a priority on my build; I'm around 2k now. Coupled with a shield and good eHP, it's an extremely rugged build.
Here's a good example how how durable it can be, taken this morning. Double elites+KW, standing in 3 desecrators, and at full health!