Twisted Abomination

Mana cost: {5}{B}
Type: Creature — Zombie Mutant
Power / toughness: 5 / 3
Set: Double Masters #111 (common)
Price: $0.08 USD

{B}: Regenerate this creature. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)
Swampcycling {2} ({2}, Discard this card: Search your library for a Swamp card, reveal it, put it into your hand, then shuffle.)

Twisted Abomination has 14 printings, first in Scourge (2003). EDHREC ranks it #13,059 among Commander cards. It appears most in Temmet, Naktamun's Will decks (1,426 on EDHREC). 2 public decks on TCG run it. It has 4 official rulings.

Legality

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

Public decks that run Twisted Abomination

Deathdancer Xira - Magic Online Theme Decks, led by Xira Arien
Eternal Might - Aetherdrift Commander, led by Temmet, Naktamun's Will

Commanders that run Twisted Abomination most

Deck counts from EDHREC.

Often played with Twisted Abomination

Cards that show up in the same decks on EDHREC.

Rulings

2016-06-08: Swampcycling is a form of cycling. Any ability that triggers on a card being cycled also triggers on Swampcycling this card. Any ability that stops a cycling ability from being activated also stops Swampcycling from being activated.
2016-06-08: You can choose to find any card with the Swamp land type, including nonbasic lands. You can also choose not to find a card, even if there is a Swamp card in your library.
2016-06-08: Swampcycling is an activated ability. Effects that interact with activated abilities (such as Stifle or Rings of Brighthearth) will interact with Swampcycling. Effects that interact with spells (such as Remove Soul or Faerie Tauntings) will not.
2016-06-08: Unlike the normal cycling ability, Swampcycling doesn't allow you to draw a card. Instead, it lets you search your library for a Swamp card. After you find a Swamp card in your library, you reveal it, put it into your hand, then shuffle your library.