what counts as playing a card mtg Parts of Play vs. Cast in MTG:

In addition to the usual Standard-release sets becoming legal in the format, Modern Horizons sets are also printed periodically with cards intended to shake up this format

Digital-only cards are everywhere in other digital CCGs because it allows them to take advantage of players not having to do things directly, like searching through their deck or keeping track of a perpetual stat loss

In a Two-Headed Giant game, life gained by your teammate won't cause Aerith Gainsborough's second ability to trigger, even though it caused your team's life total to increase

This can even lead to a couple infinite combos when paired with Oath of Teferi and Jace, Cunning Castaway or Aminatou, the Fateshifter

This may be a slight nod to cEDH on my part, but I also think that being a staple of the highest-powered Commander variant should count when evaluating a card