Urza Assembles the Titans [Dominaria United]

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 can reveal the top card of your library. if a planeswalker card is revealed this way, put it into your hand.

II—You can 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.