This gives the card an inherent combo-ablity, and lets it play a little defense as well if you are low on life
They might be ubiquitous or niche in their use cases
ANIMATOU, VEIL PIERCER Aminatou is actually an older character, first printed at the head of another commander deck as the planeswalker Animatou, the Fateshifter
Hama is definitely small for the cost, but I dont see it being very difficult to get a ton of value out of her A two mana that makes a treasure is already a pretty good deal, but this adds all kinds of upside that will be amazing in the BR deck
That goes pretty well with cards that make a lot of bodies like Myr Battlesphere or X-cost spells that create tokens
Even though these tokens are small, retriggering powerful enters effects can pull you far ahead