A 4/4 for five mana is a good rate when it has other abilities, even in these days of more powerful creatures
The mid game and late game are all about survival, accumulating permanents with triggered mill abilities like Ruin Crab and Memory Erosion, play instants and sorceries that mill some more like Mind Grind, and play spells that benefit greatly from the resulting increase in graveyards like Guiltfeeder and Avatar of Woe
Zeraora is classified as a 1-Star Shiny card in the Mega Rising set
Low pull rates and Charizards evergreen appeal make it a top long-term hold
Since you'll need several creatures in your graveyard to use Mimeoplasm, Revered One effectively, there's a graveyard theme that includes mill effects and reanimation , including a couple ways to play lands from your graveyard
Listings are abundant, and youll see auctions daily