The only reason Mega Latias may have never gotten its own card in this era was likely due to how similar both Megas look
It is an incredibly efficient mana accelerator that is seeing play as a four-of in Standard, Modern, Pioneer, Legacy, and Commander
This means that you can load your hexproof creature up with enchantments or cast a spell that gives it +3/+3 in combat, and most of your opponents removal spells wont help them
Keep several of the Jiminy Cricket cards handy throughout the deck and you should be able to stack your hand in your favor
Energy cards are required to power up a Pokmon's attacks, but you'll need the right kind of Energy
But here's the twist: older reverse holos , especially from early EX Series, eSeries, or Diamond & Pearl sets, can be surprisingly scarce in high-grade condition