Cage counter

Cage counters are a type of counter introduced in Commander 2017. They are placed on exiled creatures and artifacts allowing another card to gain their activated abilities. 
==Description==
Cage counters first appeared on <c>Mairsil, the Pretender</c> in Commander 2017. When it first enters the battlefield, it exiles an artifact or creature with a Cage counter on them. It then gains the activated abilities of the card with the Cage counter allowing one use per turn. The name of the counter alludes to the exiled card being caged.
The effect of copying the activated abilities of any card with the Cage counters caused many rule clarifications with a total of 11 different notes on the Gatherer regarding how various types of copied activated abilities are copied. Examples include being able to copy a crew ability but not an equip ability, how linked activated abilities are copied, and how multiple of the same ability can be copied. Mairsil, the Pretender on the Gatherer
==Trivia==
In Magic Online, the counter is colored green as its considered a positive effect and they share an icon with Brick and Tower counters.
==References==