Ultramarines Honour Guard is exactly the sort of card you want to spend mana on if you have a bunch of it
With cards like Fallen Of Albaz and Aluber The Jester Of Despia, you can create some of the deadliest dragons in the game
Krrik, Son of Yawgmoth K'rrik, Son of Yawgmoth is easily one of the best mono-black commanders in Magic, and it's one of the new-to-Modern cards that, thanks to MH3, are now Modern-legal
Grading can make a significant difference in card value
For example, the Pikachu [English] is referring to the CoroCoro glossy release (i.e., an English-language card printed on Japanese glossy stock)
If youre concerned about water then you can either double sleeve the card or just put a fitted PSA card sleeve over the card saver I