Suddenly, each 1/1 deathtouch for 1 mana becomes a threat, effectively having toxic 2, so to speak
In commander, Elspeth most likely fits into superfriends archetypes where playing as many Magic: The Gathering planeswalkers as possible from War of the Spark or otherwise and using effects like Doubling Season and Atraxa, Praetors Voice to let them use their ultimate abilities early
Deathtouch creatures make every combat step a dangerous proposition, while your removal keep opponents on the defensive
Rootha, Mastering the Moment Rootha, Mastering the Moment is an easy one to get behind because hasty evasive tokens can be a win condition on their own
Ajani, Outland Chaperone does less buffing, but generates lots of little creatures and has some of white's conditional removal