MAGIC: THE GATHERING
|Edition:||War of the Spark|
: Add .
, : Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
Karn's Bastion has applications in every format where counters are relevant. In Commander, you can proliferate anything from +1/+1 counters to experience counters to poison counters for an infect win!