Its even good in the current climate of people splashing equipment like Excalibur into decks like Ghalta
The base of the card isnt especially good, but once you get up to the second level, youve paid 4 mana for an Anthem and a tax on your opponents spells during your turn, and I think that would probably be a card I always played, and this has the upside of letting you pay that 4 mana in installments, as well as the fact that it can go to level three, at which point it will make one of your creatures into a really frightening attacker every turn
Charizard will find itself among the most valuable cards from Team Rocket to Champion's Path, so it's never a surprise to see Charizard near the top of any list
During its rotation, Elspeth saw some light Standard play and is sweet in counters EDH as well, but it hasn't seen much play in any Eternal formats
If you're a Limited player, ignore the mutate trigger, because this set has no artifacts or enchantments
In-game, exile is usually your best bet