For example, when mill was turned into a keyword, not only did new cards use it, but every existing card that moved cards from the library to graveyard received updated oracle text
Narset's Reversal Blue is sometimes called the fun police given its fondness for saying Nope! to what your opponents play
To attack with a creature, the creature must be untapped and cannot have summoning sickness - meaning that the creature cannot attack on the same turn its played unless it has a keyword such as Haste
The Expedition Mewtwo Holo is a Psychic-type, rendered in the brooding, imposing style that has defined the character since its first appearance in the 1999 Base Set
Basically, I think Hidden Stockpile is a Modern-power-level card if your deck is good enough at triggering revolt, and pushing the number of fetchlands is a good way to do that