Tapping the creature is part of the cost of the outlast ability itself, so you do have to tap it
Kabuto [1st Edition] #50 (Pokemon Fossil | Pokemon Cards) prices are based on the historic sales
Ideally, you should have something that covers one-shot artifact hate (Relic of Progenitus, Tormods Crypt, etc.), the interaction thats hidden in the opponents hand (Endurance, countermagic, etc.), other problematic permanents (Dauthi Voidwalker, Sanctifier en -Vec), and sometimes enchantment with static abilities (Leyline of the Void or Rest in Peace)
The converted mana cost of the spell remains unchanged, no matter what the total cost to cast it was and no matter whether an alternative cost was paid
Set Goals Decide what you want to achieve with your collection