18 Feb 2022
A creature with a counter on it is considered modified no matter what kind of counter it is or which player put it on that creature.
18 Feb 2022
A creature that is equipped is considered modified no matter who controls the Equipment that's attached to it.
18 Feb 2022
You must still pay all costs and follow all normal timing rules to play a card this way. For example, you may play a land this way only during your own main phase while the stack is empty, and only if you have not yet played a land this turn.
18 Feb 2022
An Aura controlled by an opponent does not cause a creature you control to be modified.