The problem with ramping out Gishath with rituals is that when he dies, you don't have the resources to cast him again for ages; a lot of dinosaurs are not card advantage enablers, so the rest of the deck has a lot of work to do. I think making a midrange control deck with card advantage engines that help you make land drops, and midrange wrath effects (dinosaurs love Earthquakes!) That way, if you get Gishath down, and he eats it, you can just get him down on the following turn until he sticks, making him a more effective threat.
But of course don't forget Mana Crypt, Worn Powerstone, Overgrowth, and Exploration in your list of things that will get you a faster Gishath.
I'd like to also point out that Fiery Emancipation makes Gishath and Maelstrom Wanderer into 21-damage hasty threats, which is pretty cool.