Sure, it costs half of your life points
As a reference to the real-life mechanic, characters sometimes mention these cards to be "legendary" in-universe
Some popular Starter and Structure Decks include the "Codebreaker" Starter Deck, the "Shaddoll Showdown" Structure Deck, and the "Dinosmasher's Fury" Structure Deck
In the case of Ritual Summoning, rather than the targeted monster being in your Extra Deck, you will need the Ritual Monster (always printed in a light blue card design) in your hand to be able to summon it
Its a four-power creature that reduces the costs of all your spells for each four mana creature you control, itself included

Magic" #084 "Reaper of the Card" #085 "King of Yamimakai" #086 "Barox" #087 "Dark Chimera" #088 "Metal Guardian" #089 "Catapult Turtle" #090 "Gyakutenno Megami" #091 "Mystic Horseman" #092 "Rabid Horseman" #093 "Zanki" #094 "Crawling Dragon" #095 "Crass Clown" #096 "Armored Zombie" #097 "Dragon Zombie" #098 "Clown Zombie" #099 "Pumpking the King" #100 "Battle Warrior" #101 "Wings of Wicked Fl" #102 "Mask of Darkness" #103 "Job-change Mirror" #104 "Curtain of the Dar" #105 "Tomozaurus" #106 "Spirit of the Wind" #107 "Kageningen" #108 "Graveyard & Hand" #109 "All-seeing Goddess" #110 "Hero of the East" #111 "Doma The Angel of" #112 "Life Eater" #113 "Dark Gray" #114 "White Magical Hat" #115 "Kamionwizard" #116 "Nightmare Scorpion" #117 "Spirit of the Book" #118 "Supporter in the S" #119 "Trial of Nightmare" #120 "Dream Clown" #121 "Sleeping Lion" #122 "Yamatano Dragon Sc" #123 "Dark Plant" #124 "Ancient Tool" #125 "Faith Bird" #126 "Orion the Battle K" #127 "Ansatsu" #128 "LaMoon" #129 "Nemuriko" #130 "Weather Control" #131 "Octoberser" #132 "The 13th Grave" #133 "Charubin the Fire" #134 "Mystical Capture C" #135 "Fiend's Hand" #136 "Witty Phantom" #137 "Mystery Hand" #138 "Dragon Statue" #139 "B.eye Silv
