Archon of the Triumvirate is a rare Creature — Archon card from Return to Ravnica (RTR), collector number 142. Current market price: $0.21 (foil $0.33), 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.)