Why would you want to give an opponent an additional combat phase
Innkeeper's Talent is an incredible card to help your aggressive infect cards and close the game out
Well, after a few years, its evidently showing the best results in EDH
Sure, each half costs one mana more than the split half, but you can add in interaction in your creature spots or a creature in your interaction slot and then a beater later to close out the game, and you can get both effects for one card
As we often say in Magic , your life total is a resource and ending a game on next to zero life is the same as winning it at 100 but I do believe that casual Commander players are concentrating on the transactional nature of life totals in predominantly one direction
If you see a card that is good in all four quadrants, you have an all-star