Sharktocrab

Mana cost: {2}{G}{U}
Type: Creature — Shark Octopus Crab
Power / toughness: 4 / 4
Set: Ravnica Remastered #222 (uncommon)
Price: $0.30 USD

{2}{G}{U}: Adapt 1. (If this creature has no +1/+1 counters on it, put a +1/+1 counter on it.)
Whenever one or more +1/+1 counters are put on this creature, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.

Sharktocrab has 3 printings, first in Ravnica Allegiance (2019). EDHREC ranks it #14,769 among Commander cards. It appears most in Homer, the Hermit decks (476 on EDHREC). 1 public deck on TCG runs it. It has 4 official rulings.

Legality

commander: legal
legacy: legal
vintage: legal
pauper: not legal
modern: legal
pioneer: legal
standard: not legal
brawl: legal

Public decks that run Sharktocrab

Reap the Tides - Commander Legends, led by Aesi, Tyrant of Gyre Strait

Commanders that run Sharktocrab most

Deck counts from EDHREC.

Often played with Sharktocrab

Cards that show up in the same decks on EDHREC.

Rulings

2019-01-25: Sharktocrab's triggered ability can target a creature that's already tapped. That creature won't untap during its controller's next untap step.
2019-01-25: An ability that triggers when counters are put on a permanent will trigger if that permanent somehow enters the battlefield with those counters.
2019-01-25: 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.
2019-01-25: If a creature somehow loses all of its +1/+1 counters, it can adapt again and get more +1/+1 counters.