2020-04-17 : For each creature card exiled with Lukka’s first ability, you can cast it as long as you control any Lukka planeswalker, not just the one that exiled the card.

2020-04-17 : If a creature card in a player’s library or a creature on the battlefield has {X} in its mana cost, X is considered to be 0.

2020-04-17 : If you reveal your entire library without revealing a creature card with higher converted mana cost, you put the library back in a random order and continue.

2020-04-17 : In a Two-Headed Giant game, Lukka’s last ability causes the opposing team to lose twice as much life as the power of your creatures.

2020-04-17 : Once you begin to cast an exiled card, losing control of Lukka won’t affect the spell. You can finish casting it as normal.

2020-04-17 : The ability granted by Lukka’s first ability doesn’t change when you may cast the card.

2020-04-17 : You may cast creature cards exiled with Lukka’s first ability as noncreature spells if a rule or effect allows you to do so. For example, adventurer cards from the Throne of Eldraine set may be cast as Adventures.

2020-04-17 : You still pay any costs for spells cast from Lukka’s first ability. You may pay alternative costs, such as mutate costs.