During turns when they can't, they can use Outrage instead, which increases in damage as Reshiram & Charizard lose health, potentially doing a maximum of 290
I've not run into too many mono-blue ones since people often want to run stuff from white and/or black as well
The most expensive currently is the Iono Special Illustration Rare
As it stands, based on Amazon pre-orders and considering that most products are already sold out, the prices are some of the highest MTG has ever seen
This design holds the cards more securely and can withstand your ever-growing collection, also allows your cards to show at a displaying angle
You can also consider using Tentacool and Tentacruel over Lapras ex and a Fossil Card, if you don't have Starmir ex