The trick is to either hold them all off and let them explode on their own or kill em with cleave, Puck's Shift w/ Cooldown reduction basically won't harm you in most situation.
It's also best to have a Reincarnation as a 6th (or whichever) ability and pair it up with some cooldown reductions and that Stonework Pendant, you'll be immortal during the chrono phase.

Simplest: make sure you and your buddy don't both die at the same time, so that you can take turns reviving each other.

Some handy things:

Wraith King's 0 mana reincarnate

You can midas them

They die from cleave damage (just not the main target)

You can get Puck's Phase Shift down to a low enough cooldown that you just mash it and can't take damage

Similar to above, if you take a hero with a cooldown reduction talent, get octarine core, bad juju and the magical skull item with 10% cooldown reduction aura, you can get Ursa's ult (with Aghs) up permanently similar to Puck, and combine that with Spectre's dispersion gives you 100% damage reduction. (this is OP on all levels by the way)

If you have enough mana regeneration from items, you can use the arcane sphere to live forever (or used to be able to)