Archon of the Triumvirate is a rare Creature — Archon card from RNA Guild Kit (GK2), collector number 7. Current market price: $0.15, TCGplayer market prices via Scryfall.
Flying Whenever this creature attacks, detain up to two target nonland permanents your opponents control. (Until your next turn, those permanents can't attack or block and their activated abilities can't be activated.)