Swarmyard is a rare Land card from Time Spiral Remastered Promos (PTSR), collector number 284p. Current market price: $7.22 (foil $10.93), TCGplayer market prices via Scryfall.
{T}: Add {C}. {T}: Regenerate target Insect, Rat, Spider, or Squirrel. (The next time it would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)