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That is a Daze style win right there getting value from something you might not draw, perhaps not even have

The way to tell if an ability is a triggered ability is if it starts with When, Whenever, or At

Legendary Creature - Shapeshifter Orvar, the All-Form Changeling Whenever you cast an instant or sorcery spell, if it targets one or more other permanents you control, create a token that's a copy of one of those permanents

Because you have so much control over what youre discarding, theyre also useful for strategies that care about getting certain cards in the graveyard

It's risky, but you might find the risk worth it