The objective: Make your friends say "oh ****!!" every time you cast a hydra. The main win condition is using the enchantment [[Mayael's Aria]], this is a heavy enchantment deck. So naturally you would only use it in a casual play. This enchantment is ridiculous with creatures that have +1/+1 counters. Naya likes things in fives, but with hydras you exceed that number quickly.
The objective: Make your friends say "oh ****!!" every time you cast a hydra. The main win condition is using the enchantment Mayael's Aria , this is a heavy enchantment deck. So naturally you would only use it in a casual play. This enchantment is ridiculous with creatures that have +1/+1 counters. Naya likes things in fives, but with hydras you exceed that number quickly.
After seeing rhelme92 interoperate this deck, I got a lot of ideas from him.You can check out his deck hydra attack. He found a way to speed the deck up a lot. I took some ideas from him and tweaked this deck to build up its own style.
Mana!!!!: Half of this deck deals with mana ramp, with out it your hydras are weak. From the creature side we have Birds of Paradise and Somberwald Sage . You could also use Rosheen Meanderer , but I like how Somberwald Sage lets you cast on all creature spells. To give you that over the edge mana effect I use Mirari's Wake . Plus, this guy helps make your Protean Hydra immune to damage.
Then there is the Utopia Sprawl /Fertile Ground and Mirari's Wake , these two cards help with mana ramping enough to get you cast anything in your deck.
Utility: To deal with flying, I use Frog Tongue amd Spidersilk Armor . Frog Tongue helps with flyers and gives you card draw. Spidersilk Armor combos well with all your hydras, especially Protean Hydra . It makes that guy evolve into a Phytohydra , neat little trick. Most players will forget that Spidersilk Armor not only gives your creatures reach, but also buffs their toughness.
This is a +1/+1 counter deck, so naturally I put in a Doubling Season (before they reprinted it!). If you can get your hands on one, then by all means do so. Because hydras tend to grab a lot of aggro, I put in a Death's Presence which tends to make your creatures modular. Players will not kill your creatures so fast if this on the field.
The last bit I am using is Bioshift , this idea just recently came to me from one of the comments. Its a great trick, your whole strategy is based around controlling the counters. With Bioshift we have a way of gaining even more control. We could use this card both offensively or defensively.
Creature: I split my creatures base in half, one half is hydras and the other half is utility. The only guy I have not mentioned from the utility side is Vigor , he is a +1/+1 counter god. With him on the board, your hydras become unbearable. He is the natural protector of all creatures.
Now come the hydras: I use three types of hydras, there is the Primordial Hydra , Protean Hydra , and the Savageborn Hydra .
The Primordial Hydra is probably the best one because it can win you the game the fastest. You can cast this guy early on and watch him grow as you grow your mana base. Or you can just cast him at the end with some ridicules amount of mana and win the game. Either way, he works...but he also gains you significant amount of aggro.
The Savageborn Hydra is a unique hydra in that it can still grow even after you cast it actively. That is the reason why I put it in the deck, put him out on turn 3 and then just slowly build him up to 20 +1/+1 counter. Not to mention the fact that he also hits hard, I don't see many double strikers being that big. So even if this hydra is small it can still do massive amounts of damage. I like to play this creature early, then slowly build him up. Remember you have the Mayael's Aria to add counters onto the creature, and if you have more than one than you get more +1/+1 counters. Casting him early on helps players not kill it so quickly.
The last guy is the Protean Hydra , this guy is a Vigor wannabe . With just one little enchantment, he can be hard to kill. Either get a Spidersilk Armor or a Mirari's Wake onto the field and it can sustain any damage you throw at it. The creature prevents all damage by taking off +1/+1 counters off and at the end step doubling the amount and putting them back on. It can not always double the amount of damage it takes, it can only double the amount of +1/+1 counters on it in terms of damage. Players will still hate this creature regardless.
The only other win condition built into the deck by default is to just let your hydras run. Attack all out, your bound to at least kill one person.
If you used ideas from this deck, please let me know. I like to see other people's input.