In the Magic story, Gerrard makes the sacrifice play, along with Urza and Karn, contributing to the death of Yawgmoth and the rebirth of Karn as a new planeswalker
Gorion, Wise Mentor is a 3/4 for three that copies your adventure spells
And 5 toughness means this guy can accumulate a lot of counters without dying
Magic: The Gathering is one of the longest-standing card games in history, stemming from the Dungeons and Dragons universe and produced by Wizards of the Coast
I'm not here to discuss what a move like this means to WOTC, or even speculate on their reasons for putting this kind of policy into place, but it's important nonetheless to demonstrate how this would affect the market for consumers
N (the number of "new" Mythics you get every draft) is harder to estimate than for Rares