Click that the simulator will read the card list from your clipboard
The game expects you to ramp into this attack with cards like the Baby Pokmon (whose attack attaches Energy to your bench for free) and Ho-oh ex (whose attack generates exactly the three Energy types needed by Lugia), since the game's random Energy generation means that just being able to use it once without these effects is a pipe dream at best, and only getting it off a single time probably won't even win the game
I kept re-reading it trying to see if there was something I missed that made it easier, but no, it's exactly as slow as you think it is
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With more and more uncommon legendary creatures printed with every set, there's a whole tranche of powerful commanders who don't command premium prices
A lot of the final grade comes down to whats called eye appeal: how a card looks and feels to a grader with years of experience, a bit like wine tasting