Its graceful glide paints the ocean floor with strokes of luminescence.

Deepglow Skate

When Deepglow Skate enters, double the number of each kind of counter on any number of target permanents.

Commander Masters

When Deepglow Skate enters the battlefield, double the number of each kind of counter on any number of target permanents.

"Blue, glossy green, and velvet black,
They coiled and swam; and every track
Was a flash of golden fire."
—Samuel Taylor Coleridge
"The Rime of the Ancient Mariner"

Secret Lair Drop

Double Masters

The List

Commander Anthology Volume II

As Deepglow Skate's ability resolves, you must double each kind of counter on the permanents it targets.

To double the number of each kind of counter on a permanent, put another counter on it for each counter it already has. Effects that interact with counters being put onto permanents apply as appropriate.

You can choose no targets if you don't want to double the counters on any permanents.