The ceiling is that it shows up across a bunch of archetypes and is one of the most powerful one-drops in the Historic format
A triggered mana ability is one that could add mana and triggers on an activated mana ability
That answers just over half of every God card ever printed, and of the ones that can come back from Exile, it can still remove two of those
First, it takes longer to exhaust a larger supply of sealed product, but more importantly, the larger a sets print run, the less rare the individual cards are too, which tends to lower the price of a sealed product
For this example, let's use Serra Avatar, a beloved finisher for casual decks
Strionic Resonator will tap with two mana and then copy any triggers above like ETB stuff or my upkeep triggers or The Ninth Doctor