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The flashback cost is equal to that card's mana cost
What affects the value of Circle of Protection: Green
Things can quickly spiral out of control over a few turns
Potential Infinites There are a few infinite loops in here to generate all the landfall we could ever need - the Temur Charger can be turned face up at the cost of revealing a green card from hand, so anything that costs 1 to sacrifice it can be looped by paying the 1 and sacrificing it, returning it as a land, tap for 1 green, morph for 0 mana, then paying the 1 and sacrificing it, ad infinitum
You also have cost-reduction cards that can act similarly to mana dorks in a deck with so many colorless cards