pokemon noble victories booster box "Noble Victories" 10-Card Sealed Pack (Hydreigon) X1 including the newly discovered Mythical Pokémon Zarude Noble Victories (TCG) - Bulbapedia,

Five mana for 5 damage to any one target is roughly on rate, 8 mana to deal 10 to two targets is game-winning, and it can only get better

For spells with X in their mana costs, use the value chosen for X to determine if the spells converted mana cost is 3 or less

For example, even if we interpreted your library as part of the battlefield for this purpose, slipping one into the card sleeve of a card in your library during a search effectively marks your deck, and that's not allowed

Nyxbloom Ancient This mono-green triple green mana seven-drop 5/5 trample enchantment creature is next

Of course, it takes three different Xyz monsters to make, so it had to be worth it