Ill also tell you which platforms these apps are available on as well
It's very strong in multiplayer since you are more likely to be running at least one opponent with Green ramp and two-drop ramp spells like Rampant Growth and Farseek are getting added to ramp brews in Commander over conventional ramp like Cultivate and Kodama's Reach, so on the turn you have three mana, one player casting a two mana ramp spell with an extra land is pretty likely, and if not, then someone probably cast Explore spells or dropped an Exploration and an extra land or two
Then, during your end step, Meren reanimates a creature in your graveyard with a mana value less than or equal to the number of experience counters you have
But it is not always you have access to red mana in the first Two-Three turns (where you want to burn that Factory or Lion or whatever) because there are so few red mana-sources
You might also consider running Horn of Gondor to increase your human creature count, or Karvanista, Loyal Lupari to spread out +1/+1 counters on attacks, or even Cloaked Cadet for some extra card draw