Stage 2s are too slow in the mess that is 2018 expanded, you will seldom get it out before you get nailed with a red card into hex maniac chain which will make its ability irrelevant anyways. The GGC cost puts the card at a pretty big disadvantage against one attachment attackers, Virizion used to have enough HP to reliably tank a hit on turn 2 but that's no longer the case. Genesect also only has 170 which puts it in easy OHKO range for Zoroark. Hex Maniac ability lock is also pretty fatal to Genesect's ability which was very important for the deck. It was as good of a deck as it was because Lysandre wasn't a thing in those days so that ability was very valuable.
VirGen hasn't been good in expanded for several years now and it's not due for a resurgence. VirGenCel is still one of the best decks in Legacy if you can find people to play it with.