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Reach
When this creature enters, you may sacrifice another creature. When you do, destroy target nonland permanent.
When this creature dies, you may gain 1 life for each creature card in your graveyard. If you do, exile this creature from your graveyard.
Notably, this means that players won't get to know what nonland permanent you plan to target before you choose whether to sacrifice a creature.
Skyfisher Spider's first triggered ability doesn't have any targets. If you choose to sacrifice another creature, a second triggered ability (called a "reflexive" triggered ability) goes on the stack and you choose a target nonland permanent at that time. Players may respond to that second ability as normal.
