You don't pay in one lump sum because there's no prompt to pay a bunch - you get three triggers, each saying "you can pay a life for a card," and each resolves one at a time

Dragon" #083 "Castle of Dark Illusions" #084 "Reaper of the Cards" #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" #100 "Battle Warrior" #101 "Wings of Wicked Flame" #102 "Mask of Darkness" #103 "Job-Change Mirror" #104 "Curtain of the Dark Ones" #105 "Tomozaurus" #106 "Spirit of the Winds" #107 "Kageningen" #110 "Hero of the East" #112 "That Which Feeds on Life" #113 "Dark Gray" #114 "White Magical Hat" #115 "Kamion Wizard" #116 "Nightmare Scorpion" #117 "Spirit of the Books" #118 "Supporter in the Shadows" #119 "Trial of Nightmares" #120 "Dream Clown" #121 "Sleeping Lion" #122 "Yamatano Dragon Scroll" #123 "Dark Plant" #124 "Ancient Tool" #125 "Faith Bird" #126 "Orion the Battle King" #127 "Ansatsu" #128 "LaMoon" #129 "Nemuriko" #130 "Weather Control" #131 "Octoberser" #132 "The 13th Grave" #133 "Charubin the Fire Knight" #134 "Mystical Capture Chain" #135 "Fiend's Hand" #136 "Witty Phantom" #137 "Mystery Hand" #138 "Dragon Statue" #139 "Blue-eyed Silver Zombie" #140 "Toad Master" #141 "Spiked Snail" #142 "Flame Manipulator" #143 "Necrolancer the Timelord" #146 "Temple of Skulls" #147 "Monster Egg" #149 "Lord of the Lamp" #150 "Akihiron" #152 "The Melting Red Shadow" #154 "Fire Reaper" #155 "Larvas" #156 "Hard Armor" #157 "Firegrass" #158 "Man Eater" #159 "Dig Beak" #160 "M-warrior #1" #161 "M-warrior #2" #162 "Tainted Wisdom" #163 "Lisark" #164 "Lord of Zemia" #165 "The Judgement Hand" #166 "Mysterious Puppeteer" #167 "Ancient Jar" #168 "Darkfire Dragon" #169 "Dark King of the Abyss" #170 "Spirit of the Harp" #171 "Big Eye" #172 "Armaill" #173 "Dark Prisoner" #174 "Hurricail" #175 "Ancient Brain" #176 "Fire Eye" #177 "Monsturtle" #178 "Claw Reacher" #179 "Phantom Dewan" #180 "Arlownay" #181 "Dark Shade" #182 "Masked Clown" #183 "Lucky Trinket" #184 "Genin" #185 "Eyearmor" #186 "Fiend Refrection #2" #187 "Gate Deeg" #188 "Synchar" #189 "Fusionist" #190 "Akakieisu" #191 "LALA Li-oon" #192 "Key Mace" #193 "Turtle Tiger" #194 "Terra the Terrible" #195 "Doron" #196 "Arma Knight" #197 "Mech Mole Zombie" #198 "Happy Lover" #199 "Penguin Knight" #200 "Petit Dragon" #201 "Frenzied Panda" #203 "Phantom Ghost" #204 "Mabarrel" #205 "Dorover" #206 "Twin Long Rods #1" #207 "Droll Bird" #208 "Petit Angel" #209 "Winged Cleaver" #210 "Hinotama Soul" #211 "Kaminarikozou" #212 "Meotoko" #213 "Aqua Madoor" #215 "Flame Ghost" #216 "Dryad" #217 "B

Everdawn Champion 0 This is a bit small and pointless to do much of much
Mathas, Fiend Seeker Mathas, Fiend Seeker doesnt have as big an impact on games as other legendary creatures on this list, but I always enjoy seeing this Mardu commander on the table
Should you include this, then when a critter arrives on the battlefield, it takes two damage from a Red and Enchantment source, so a Protection from Red or Enchantments creature will remain immune to the damage The goal of this project is to have fun with stuff for a turn
As red can be quite creature-focused, value-based additional damage is another excellent tool to add to your collection