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Once per turn, during your opponent's Standby Phase: This card's ATK becomes double its current ATK until the end of this turn

Both offense and defense are strong

Cannot be used as Synchro Material, except for the Synchro Summon of a Dragon Synchro Monster

Obviously, it would make sense for Charizard to show up in Phantasmal Flames, but as Mega Brave and Mega Symphosia are already out in Japan, and these sets didn't feature any Mega Attack rares, it seems unlikely they'll appear in the equivalent English Mega Evolution set

It just does The Thing for a single generic mana that any deck can pay for, and is thus worth highlighting

This means if a creature has double strike, its redundant to have first strike also