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Sleeper Agent For 1 mana, you could do worse in the right decks
Smothering Tithe will give you at least one Treasure a turn unless your opponents pay mana and youll profit either way by slowing them or ramping you
The effect is to "copy the next spell/ability that contains X." The first thing that comes to mind is using "Chord of Calling" to assemble creature combos like the Kiki-Jiki combo, perhaps
Its also one of the few cards on this list that can generally hold its own in the modern game, though against other Charizards, such as the Dark type, Tera Charizard ex thats currently stomping all over the meta it may well have some trouble
There are a few cards synonymous with treasures that tend to impact a decks power level more than others, however