Mythic cards are opened out of packs far less often than a common
To solve this problem, we have Negate and Mystical Dispute, which give us counters that are cheap enough to answer something like Teferi, Time Raveler no matter who wins the die roll
While exile is lovely and very scary to play against this card is too ineffective at doing what you mainly want it to do
Theres a decent amount of card removal to help enact your game plan, too, while Yuna, Grand Summoner and Walking Ballista still command a decent price
And if you like reading cross-game strategy to sharpen your instincts, this quick read shows the same lesson in a different format: MTG Foundations Sleeper Is an Underrated Answer to a Problematic Archetype
What incubate allows you to do is generate a Phyrexian Incubator token with a number of +1/+1 counters on it