While you opening a Tree of Redemption in your $10 pack does mean that someone, somewhere is happily opening a Jace, the Mind Sculptor in their pack, this doesn't really do much to soften the blow of the bad boxes and packs that will be fairly common with Masters 25
But the right archetypelike faeriesmakes good use of that, so you should keep it on your radar
The focus will not be on the EV of the events (I'm not an Arena economy expert), but rather on which event might be the best fit for your skill level and some adjustments you can make to maximize your odds of success in each event
Outside of mana dorks, Unesh, Criosphinx Sovereign provides a sweet discount to our changelings while drawing tons of cards and Rooftop Storm lets us cast all our changeling for free
Charizard cards vary widely in value and can be worth anywhere from $25 to over $50,000
In a deck that already has strong cats, the turns you play this card and swing are very profitable in your favor