A 2/2 for three mana, Captain Rex Nebula has the incredibly unique trait of being able to convert any nonland permanent you control into a Vehicle with crew 2 and power and toughness equal to its mana value at the beginning of combat on your turn
Both players vanguards start the game in the command zone and stay in play for the duration, modifying the games rules accordingly
Yu-Gi-Oh: 10 Trap Cards That Were Banned For Being Too Overpowered For example, if Call of the Haunted or Snatch Steal is active and afflicting monsters, they will be returned to their owner's hand, but the monsters will remain on the field completely unbothered when they should actually be sent back to the graveyard or returned to their true owner
Angel of Serenity: My problem playing Angel of Serenity is always if I want to put one or more of my own creatures under it, so that I can rebuild after a Wrath of God
You can see an overview here: 90% (4th card), 60% (5th card) 5% (4th card), 20% (5th card) 1.666% (4th card), 6.664% (5th card) 2.572% (4th card), 10.288% (5th card) 0.5% (4th card), 2% (5th card) 0.222% (4th card), 0.888% (5th card) 0.04% (4th card), 0.16% (5th card) So, if you open 1,000 boosters, there should be one to two cards of the crown rarity