Captain Sisay works as card advantage and a tutor, but you can find similar sources of card advantage in the likes of Hour of Need or Beast Whisperer, depending on which element you want to keep
There are a lot of ways a spellslinger deck can deal out chip damage to opponents with cards like GuttersnipeGuttersnipe and Coruscation MageCoruscation Mage, along with ways to amplify your damage output with cards like Ojer Axonil, Deepest MightOjer Axonil, Deepest Might and Mechanized WarfareMechanized Warfare
Creatures with tempo evasion enable aggressive decks to win quickly and build advantages on board
It also keeps the life totals moving if people do decide to indulge
And with card advantage scarce outside blue at the time, Forbid succeeded as a pure control finisher and still does in Commander
Honorable Mention: Board Wipes Good board wipes are excellent removal spells, and are ideal for handling threats with hexproof or shroud (targeted removal, on the other hand, is useless in those cases)