Boast ties a large part of your creatures value into attacking, which feels like a relieving de-escalation from an environment where most playable cards get their value on ETB (or even earlier in the case of adventures!) Even more interesting, the range of payoffs for boast are extremely open-ended, including all sorts of utility effects and other incentives not normally associated with attacking
An Extremely Broken Character Storm, Force of Nature is a terrifying card
Commander does not have a metagame like Modern, but it does have a local meta
This is a card thats not what we thought, but it is still quite good
Each way, there's a slight bit of overhead in changing state, but thankfully those changes are rare, and they only get rarer as we go along
The player gets incredible value from doubling those effects, which are common in Sultai colors, and cards like Strionic Resonator and Panharmonicon can push it to the next level