Urza Assembles the Titans is a rare Enchantment — Saga card from Dominaria United Promos (PDMU), collector number 37p. Current market price: $0.46 (foil $0.70), TCGplayer market prices via Scryfall.
Read ahead (Choose a chapter and start with that many lore counters. Add one after your draw step. Skipped chapters don't trigger. Sacrifice after III.) I — Scry 4, then you may reveal the top card of your library. If a planeswalker card is revealed this way, put it into your hand. II — You may put a planeswalker card with mana value 6 or less from your hand onto the battlefield. III — You may activate the loyalty abilities of planeswalkers you control twice this turn rather than only once.