Lurker in the Deep Impending 3 (was impending 4) Lurker in the Deep is a unique build-around for Seek decks that have been too slow for the metagame
Looking beyond that, mutants broadly care about +1/+1 counters, a theme present among Simic and Fallout mutants and emphasized with Teenage Mutant Ninja Turtles
Meanwhile, Tasha will give you free creatures whenever you cast spells you dont own and thatll probably happen a fair bit given you can at least exile up to one instant or sorcery from each opponents graveyard to then cast for free later
Charizard ex also has 180 HP enough to survive a hit from some of the most powerful attacks, like Mewtwo exs Psydrive
The error is small when the deck is very large relative to the number of draws, but for typical MTG parameters (60-card deck, 7-card hand), the difference between binomial and hypergeometric results is measurable and can lead to incorrect deck construction decisions
Just watch out for those pesky board wipes