Formidable Speaker is just an amazing creature: You get to filter a useless card into something meaningful, untap powerful mana dorks, and abuse flicker effects in one fairly cheap package
Generally, it makes use of its wizard creatures abilities to control the battlefield before using Inalla, Archmage Ritualists activated ability to hit players for 7 life at a time
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instead, it just grants your deck a powerful ability
He's very obviously a lobster-person with lobster claws and a lobster face, but most of his anatomy can be described as being a bipedal humanoid with lobster bits and bobs tacked on
Just like Llanowar Elves, this means it can be used to cast spells