Planets - at least the ones we've seen so far - are lands that enter tapped, and can tap for a certain type of mana just like any other type of land
(2023-02-04) To proliferate, you can choose any permanent that has a counter, including ones controlled by opponents
The OTK is having an token on your opponents field with LOST WORLD (OTK is still possible without token, you opponent just needs a monster on their side of the field), getting DUGARES on the board with UCT, activating DUGARES's effect to double UCT's attack, linking DUGARES and another card away for PENTESTAG (that points to UCT), destroy a monster in your hand to change your opponents monsters to face down defense position, attack every monster with UCT for 7000 piercing dmg (and directly after all monsters are gone
Those limited edition cards or ones from older sets are like hidden treasures waiting to be discovered
3) Destroy 1 Spell or Trap Card on your opponent's side of the field
My most exciting match of the Sealed portion however came in round 3