Well, with Altar of Dementia out, you can take out another player by eliminating their library altogether, giving them a very narrow window to do anything by the time their next draw step comes around
Would you rather play a cantrip right before you take your turn or leave no mana up because you cast a Network Terminal
If the Sculler hits a removal spell, its easy to kill the Sculler instead of a Dragon, since they know theyre going to get another removal spell for the Dragon thats threatening to kill them
An artifact that costs no mana, you can tap it and sacrifice it to look at the top of target player's library, then draw a card at the start of the next upkeep
These are cards that are very powerful and can often boost up the power of a deck significantly, which can lead to weaker decks falling behind
Being a guy himself also has some tempo merits allowing you to block a bit better while your aerial force gets to work