I won't go deep into this topic here because this is a deck tech not a format philosophy piece, but suffice to say I think it's Mono Red, especially when you're on a budget and don't have access to the top handful of staples like Dockside Extortionist, Underworld Breach, and Jeska's Will
Thoughtseize Thoughtseize sees play wherever its legal, and Explorer is no exception
For example, it's playable in the Modern graveyard spells matter deck that uses Dragon's Rage Channeler that wants the right stuff in the graveyard to get to 3/3
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That's not even accounting for Singleton formats like Commander
It's a very lethal creature and is the reason this saga makes the list