When properly Synchro Summoned, Trishula can banish one card from the opponent's field, one from their Graveyard, and one randomly from their hand
What made them especially good at the time was their status as Pendulum monsters, allowing them to take advantage of traps to negate or banish the opponents monsters, only to come back through Pendulum summoning the following turn
It toes the line of enshrinement in the format like Sol Ring even though it also plays with the unfun play patterns and reduction in diversity traits that banned cards have
With these powerful abilities, they become a great support option for all manner of Spellcaster-focused decks
Big splashy alternate wincons are definitely good for Commander
As for our Standard Thoughtseize, Devour Intellect, it's definitely not a Thoughtseize, but it still felt quite powerful