Examining the recent frog commanders on EDHREC, we can see that some Glarb, Calamity's Augur and Clement, the Worry-Wart players are running this card, presumably because they want to play frog tribal and there just aren't enough frogs
Kratos is one big Punisher effect, so your opponents will have to weigh cost benefit of not attacking or tapping their creatures somehow
However, this ability triggers only once in the entire game, so you wont have a field full of free mana, just one extremely free mana
Tap any promo for the full image: Deep dive with full attack text for every promo: the promo gallery page
What matters most is that your storage system makes sense to you and helps you stay consistent
The group would be raw but Brian hoped it could come up with areas that the normal designers hadn't thought of