Skitter Eel — ruling 1

You can always activate an ability that will cause a creature to adapt. As that ability resolves, if the creature has a +1/+1 counter on it for any reason, you simply won’t put any +1/+1 counters on it.

Skitter Eel — ruling 2

If a creature somehow loses all of its +1/+1 counters, it can adapt again and get more +1/+1 counters.

Skitter Eel : règles, fonctionnement et interactions (MTG)

Skitter Eel is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

: Adapt 2. (If this creature has no +1/+1 counters on it, put two +1/+1 counters on it.)

How it works : Skitter Eel

Original English text — Wizards of the Coast / Scryfall

#1January 25, 2019· Wizards of the Coast
You can always activate an ability that will cause a creature to adapt. As that ability resolves, if the creature has a +1/+1 counter on it for any reason, you simply won’t put any +1/+1 counters on it.
No other card is named in this ruling.
#2January 25, 2019· Wizards of the Coast
If a creature somehow loses all of its +1/+1 counters, it can adapt again and get more +1/+1 counters.
No other card is named in this ruling.