Giant Shark sports a lot of text that you dont even need to bother to read because it has all been updated in the Oracle text, which you can find on Gatherer, Scryfall, and some online collection trackers
There is a small window of cards like mass removal and colorless options like Maze of Ith that can play havoc with it
Rounding things out, we have Urzas Saga and Yavimaya, Cradle of Growth
Sorcery Color tag templates(None) Explosive Vegetation Search your library for up to two basic land cards, put them onto the battlefield tapped, then shuffle
I dont expect boast to provide problematic snowball advantage but its important to recognize that it is more powerful than it looks because it provides a repeatable advantage
My goal is for the turn I cast Sami, Wildcat CaptainSami, Wildcat Captain to feel like an apocalyptic event