Rather than working off of storm count, it counts up the total mana value of other spells youve cast this turn
Blue isnt lacking card advantage, but your blue decks will gladly accept more
Neera, Wild Mage decks are full of cheap cantrips like Ponder because, unlike proper cascade cards, Neera can free-cast anything from the top of the deck regardless of mana value
For more continuous effects in white, youd be looking at creatures and effects that want battlefield presence
Unfair Stamp only works if one of your mons was Knocked Out during your opponents last turn, so its quite a niche card
That said, there might be a situation where youll want to put Furor of the Bitten on an opponents creature and Mires Grasp on one of your own