The true impact of this card, and the Room mechanic as a whole, will only become clear as we see more previewed cards in the next few days
Whenever another creature you control enters, if it wasn't cast, put a +1/+1 counter on this creature and this creature can't be blocked this turn
Sometimes, a card is just too weird, too annoying, or too logistically complicated for the game to handle
That is the 12th most-played Commander overall and the top red and mono-colored leader ever run, so you have to get here on my list and make it really high on it too
If you happen to have six mana sitting around, you can always buff her up too, but really you just want to make as many tokens as possible before you get wrathed