Shadowverse

By turn six, with a perfect ramp, you might already have a Bahamut out, right?

You need to ramp for 5 turns in defense and 4 in attack, and have one of the three cards from your deck ready in your hand to clear them out. Five, if you're playing with Light Blast (many don't play it anymore, after all the hype/complaining – it's funny). The probability of this happening exists, but it's EXTREMELY LOW. You can also use Light Blast on Bloodmoon, but that's just awful, and there might not be any Serpents there, and you'll end up looking like a complete fool.