Heya, new(ish) player here!

I've played competitively like 9 years ago, and I'm just getting back. I have most cards to be able to build a Mega Zard deck, but is the deck still competitive/viable? I know there are better options and I might get to them eventually, I just wanna be sure if I can go face to face with some of the better decks around. If you care to share a decklist as well I'd appreciate it! Thank you very much.