Four mana is a lot, having it spare all in one go to do something that has no impact on the board just isn't viable too much of the time
You could do the exact same for Town-Razer Tyrant, even though the dragon's ability doesn't actually involve a counter of any kind
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But in an official format like Vintage, it would lead to way too many problems to the point it was not worth keeping them in the format
Whenever you discard a card, you may either draw a card, create a Treasure token, or make each opponent lose three life
Implement of Improvement Bandage Heal Prophecy Fountain of Renewal Revitalize Renewed Faith Scroll of Avacyn While I ruled out cards like Silent Gravestone from the yard hating cards for costing too much total I am happier including Fountain of Renewal in this list as you want to keep it in play when under pressure and want to cash it in when you are running out of gas