The rules for Aprils cards was: These cards had to be primarily designed to counter a strategy, not enable one Creatures had to meaningfully advance the game beyond their ability no Drannith Magistrate style 1/3s, these cards had to have some purpose in making your opponents lose by conventional, fair means
It gives the card its opacity, its stiffness, its particular feel when you riffle a stack
Examples of these are Xenagos, God of Revels, Kaalia of the Vast, and Aurelia, The Warleader
Drannith Magistrate stops your opponents from casting spells from anywhere other than their hands
Status effects sometimes require a coin flip to be removed and there is no guarantee that a card in the player's deck will not be in their prize area when they go to search for it with Buddy Buddy Poffin or Nest Ball