Chancellor of the Annex is a rare Creature — Phyrexian Angel card from The List (PLST), collector number NPH-6. Current market price: $3.25, TCGplayer market prices via Scryfall.
You may reveal this card from your opening hand. If you do, when each opponent casts their first spell of the game, counter that spell unless that player pays {1}. Flying Whenever an opponent casts a spell, counter it unless that player pays {1}.