Chancellor of the Tangle is a rare Creature — Phyrexian Beast card from New Phyrexia (NPH), collector number 106. Current market price: $1.24 (foil $19.30), TCGplayer market prices via Scryfall.
You may reveal this card from your opening hand. If you do, at the beginning of your first main phase of the game, add {G}. Reach, vigilance