Gaia Titans are rising...

[Bloodfrost]

Thunder then lightning:

 

Gaia Titan: Thunder

Thunder / Xyz / Effect

Rank 6

2 Level 6 monsters

Your opponent cannot select monster you control as an attack target (except "Gaia Titan: Thunder"). Once per turn: you can select 1 Monster Card from your opponent's Graveyard and remove it from play.

[Dokutah]

doesn't seems that good to be honest.

 

his stat is big and nice but currently there is no deck that can consistently summon rank 6, its protection effect is outdated by most method of removal we have, last effect may hold merits... however is unfortunately slow since most of grave effect we have is activated as soon as it hits the graveyard. so turning this effect into Quick Effect ala D.D Crow maybe not a bad thing to considered...probs you can be cautious and test the water by making it require a detach first

 

speaking of detach. im intrigue by your design choice of not having any detach effect. granted cards pool that interact with this condition is really small

[Flash Flyer - Sakura]

To be fair, you technically still have stuff like Hieratics (albeit somewhat hard to use nowadays) who can Rank 6, but yeah, said Decks aren't really good right now. We all know how much Konami ditched them in favor of buttering up Ranks 3 and 4. 

 

Stats are fine, but effects range from being iffy to slow. Effect removal is very common and this doesn't stop them, and as noted above, once monsters hit the Graveyard, they already trigger so it's too late to remove them. Then again, there are some Decks that thrive on banished cards (Metaphys wouldn't care about being banished in the Graveyard [for Trade-In purposes] since they trigger when they do.)

 

Agreed on being more reactive though and making it a quick effect. The Rank 6 pool (generically) is still small, but you have more common threats to deal with than those who rely solely on battle destruction.

[Bloodfrost]

Thanks for telling me. At first I didn't know what you were talking about but now I understand.