This is the fact that almost all of them come in tapped, which threatens to massively slow down your progression
(It counts as flipping a coin, not rolling a die.) Each time a spell or ability instructs you to flip a coin, you may apply Pokey's second ability as a replacement effect to roll a d20 instead
Especially if you do something like chop a creature down and then have it take combat damage, this creates far more bang for your buck, and all attached to a reasonable creature to boot
This is an excellent addition for the Rhoda, Geist Avenger and Timin, Youthful Geist Partner decks and a slam dunk for Kadena, Slinking Sorcerer Morph decks
Starting with the Ursula's Return expansion, the shift mechanic gained other ways of being activated beyond paying an ink cost