Ramping by four mana is no joke. Gargos, Vicious Watcher reduces the cost of all your other Hydras, allowing you to cast a X=5 Primordial Hydra for three mana. When you untap next turn, you've got a 10/10 with trample—and if an opponent targets it for removal, you get to kill one of their creatures by forcing it to fight the 8/7 Gargos.
This deck is all-in on overwhelming your opponents with more threats than they can deal with. Destroy one creature, and two more take its place. Almost like a—oh, right! I get it.
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