Tier 3 : These decks remain relevant in the meta and can achieve occasional wins, even against higher tiers
Evil Comes to Fruition is good if you have Avenger of Zendikar around, too
First of all
Yes, Mega Evolution cards are valuable due to collector demand, nostalgia from the XY era, and limited availability, with certain iconic Pokmon and Secret Rare versions commanding significantly higher prices
If an effect allows you to spend mana "as though it were" mana of any color or type, that allows you to spend mana you couldn't otherwise spend, but it doesn't change what mana you spent to cast the spell
I gotta admit, having to write articles every week, only to wait until the last possible minute to actually work on it totally reminds me of my college years