NorthernWarlord

Maybe not too pricey, but too complicated? I don't know.

Yes. It works.

Since the other half does not run any trample, how about Colossal Might?

Yeah... At least it is supposed to be...

Should I replace Pit Fights with them?

Thanks, man. I appreciate it.

Slith Bloodletter is mainly there because when your opponent's plans have been ruined and you have killed their possible blockers, you can start hitting. You hit harder every turn.

And otherwise it is almost like Drudge Skeletons.

I know that feeling...

Well, Clan Defiance is pretty deadly card if you have lot of mana.
In the other hand, you'll most surely have a lot of mana in a hydra deck. Especially when you run Xenagos.

If you are trying to be standard, Signal the Clans gets you semi-random creature, and I think it is pretty cool.
And about lands... If you get two temples, and you are adding two Xenagoses in, I recommend adding something about 5 mountains so you will get one mountain or one temple every game.

There are ten cards that make your opponent discard...
Is it clever to add it? I'm not sure.

I would remove Slippery Boggles in order to replace them with mana elves such as Llanowar Elves.
That cuts the budget a bit.

Thanks. It is the jewel of my collection.

"Splashing" means that you add some cards of other color into it. You remove few cards in order to add cards of other color that go well with the deck's strategy. You have to switch some of the lands too.

If I would have to splash some red here, I would remove at least one Vastwood Hydra, one Karametra's Acolyte, one Crowned Ceratok and one Savage Summoning.

I once thought adding Death Pit Offering, since this had back then lots and lots of graveyard-returning. Nowadays... I'm not sure. Should I really add it?

I like it! I have always loved the possiblities of G/U card draw!
Maybe Overbeing of Myth? That guy is the queen/king/whatever-it-is in this deck!

I'm actually not sure... While this deck has lots of mana ramp (thanks to Karametra), I could add Storm Herd to end games quickly(?).

The first one:
You cast Battlesphere. You pay additional 1. You get single myr. Then Battlesphere enters the battlefield, so you get 4 myr, plus 1 myr from Genesis Chamber. (Total 6 Myr.)

The second:
Play Origin Spellbomb. You pay additional 1. You get single myr. Then you sacrifice spellbomb, so you get another myr. (Genesis Chamber and Myrsmith won't affect the Myr token, so you get total 2 Myr.)

The third:
Yes. You get one Myr and 5 life in the case you pay extra 1 while casting the spellbomb.

Maybe... I'll put two in.

Yeah, it would, but it is pretty priceful.