Modern Horizons 3 is reinvigorating energy counters, introducing some powerful new cards that make use of this resource in intriguing and diverging ways
Its a deterrent for your opponents to chump-block and it gives you an additional benefit even if your creature dies in combat
Granted, the ability explicitly states "you may " meaning you do not have to do this and could reserve it for times when you have no Heroes in hand, but if that's how the card needs to be played, then all it is, is a 2/4 creature that lowers the cost of Heroes by 1C, something not worthy of leading a Commander precon deck in the current meta
Mendicant Core, Guidelight Mendicant Core, Guidelight is a nice artifact build-around card, and very cheap at just 2 mana
It starts as a half-priced Anointed ProcessionAnointed Procession, which is extremely powerful on its own, and it also compensates for the one-turn downside naturally, considering how easily token decks can swarm even on limited mana