Do you think it may be possible a green blocker deck focussed in megagargomon Ace instead of build a deck around rapid X? I love the idea of having a pure Megagargomon defensive alternative :)
It's a bit random but it goes into Quartzmon. If you know Quartz is on top of your deck (thanks to Mamemon putting cards back on top), you can Blue Card into Quartz with just Betsumon out and it's kinda nuts