The word if in the text of the triggered ability, and the very condition its on the battlefield tell us that this ability is conditional
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Then these surveil 1 on arrival to the battlefield, so they can give you card draw security, and then also send it to the graveyard if you don't immediately need it, or just want reanimation, flashback or delirium for later use
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It's an instant, and if you have the mana available after a board wipe, you can get your creatures back before you are attacked by one of your opponents