Is there other old rules that should be played around with a bit, like mana burn is with Yurlok of Scorch ThrashYurlok of Scorch Thrash
Regardless of your design goals, power level is an exceedingly complex, abstract idea that is tough to apply

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As you cast your spells, youll keep generating more Birds
Eldrazi Ramp has only one card in the entire deck that scales based on what point in the game it is