If you like this effect, you can find similar ones in Campaign of Vengeance and Mishra, Claimed by Gix
The idea that it created a constant stream of creature tokens as long as it stayed on the battlefield proved to be an answer that was both flavorful and played well
In Legends , the following card appeared: The art of It used to be something players enjoyed making fun of, so the Creative team at Wizards at the time came up with a flavor explanation
Please note that this card was graded by CGC and awarded a Mint 9 grade with the following subgrades: Centering 9, Surface 9, Corners 8.5, Edges 9
Trial of Zeal: The effect is really good, especially because it has "or player," but the cost isn't so great
The remaining cards I want to suggest are all cards that pay you off for having high power creatures and they also happen to ramp your mana, so theyre a perfect fit for the deck