502.13a.

Cumulative upkeep is a triggered ability that imposes an increasing cost on a permanent. "Cumulative upkeep [cost]" means "At the beginning of your upkeep, put an age counter on this permanent, then sacrifice this permanent unless you pay [cost] for each age counter on it." If [cost] has choices associated with it, each choice is made separately for each age counter, then either the entire set of costs is paid, or none of them is paid. Partial payments aren't allowed.

Example: A creature has "Cumulative upkeep {W} or {U}" and two age counters on it. When its ability next triggers and resolves, the creature's controller puts an age counter on it and then may pay {W}{W}{W}, {W}{W}{U}, {W}{U}{U}, or {U}{U}{U} to keep the creature in play.

Example: A creature has "Cumulative upkeep-Sacrifice a creature" and one age counter on it. When its ability next triggers and resolves, its controller can't choose the same creature to sacrifice twice. Either two different creatures must be sacrificed, or the creature with cumulative upkeep must be sacrificed.

Creature Type

Creatures and tribals share the same set of subtypes. These subtypes are always a single word and are listed after a long dash: "Creature — Human Soldier," "Artifact Creature — Golem," and so on. These subtypes are also called creature types. The list of creature types, updated through the Tenth Edition set, is as follows: Abomination, Advisor, Aladdin, Albatross, Alchemist, Ali-Baba, Ali-from-Cairo, Alligator, Ambush-Party, Angel, Ant, Antelope, Ape, Archaeologist, Archer, Archon, Artificer, Asp, Assassin, Assembly-Worker, Atog, Aurochs, Avatar, Avenger, Badger, Ball-Lightning, Bandit, Banshee, Barbarian, Basilisk, Bat, Bear, Beast, Bee, Beeble, Being, Berserker, Bird, Blinkmoth, Boar, Bodyguard, Bringer, Brother, Brownie, Brushwagg, Bull, Bureaucrat, Camarid, Camel, Caravan, Caribou, Carnivore, Carriage, Carrier, Cat, Cave-People, Centaur, Cephalid, Cheetah, Chicken, Child, Chimera, Citizen, Clamfolk, Cleric, Cobra, Cockatrice, Constable, Construct, Cow, Coward, Crab, Crocodile, Crusader, Cyclops, Dauthi, Demon, Deserter, Designer, Devil, Devouring-Deep, Dinosaur, Djinn, Dog, Donkey, Doppelganger, Dragon, Dragonfly, Drake, Dreadnought, Drill-Sergeant, Drone, Druid, Dryad, Dwarf, Eater, Eel, Effigy, Efreet, Egg, Elder, Elemental, Elephant, Elf, El-Hajjaj, Enchantress, Entity, Erne, Essence, Exorcist, Expansion-Symbol, Eye, Faerie, Fallen, Farmer, Ferret, Fiend, Fish, Flagbearer, Fox, Frog, Frostbeast, Fungus, Fungusaur, Gaea's-Avenger, Gamer, Gargoyle, General, Ghost, Ghoul, Giant, Gnome, Goat, Goblin, Golem, Gorgon, Graveborn, Gremlin, Griffin, Guardian, Gus, Gypsy, Hag, Harlequin, Hellion, Heretic, Hero, Hipparion, Hippo, Homarid, Homunculus, Hornet, Horror, Horse, Horseman, Hound, Human, Hydra, Hyena, Illusion, Imp, Incarnation, Infernal-Denizen, Inquisitor, Insect, Island-Fish, Jackal, Jellyfish, Juggernaut, Kavu, Keeper, Kelp, King, Kirin, Kithkin, Knight, Kobold, Kor, Kraken, Lady-of-Proper-Etiquette, Lammasu, Leech, Legionnaire, Lemure, Leper, Leviathan, Lhurgoyf, Licid, Lizard, Lord, Lurker, Lycanthrope, Mage, Maiden, Mammoth, Manticore, Marid, Master, Masticore, Medusa, Mercenary, Merchant, Merfolk, Metathran, Mime, Minion, Minor, Minotaur, Miracle-Worker, Mist, Mob, Mold-Demon, Monger, Mongoose, Monk, Monster, Moonfolk, Mummy, Murk-Dwellers, Mutant, Myr, Mystic, Nameless-Race, Narwhal, Nephilim, Niall-Silvain, Nightmare, Nightstalker, Ninja, Noble, Nomad, Octopus, Ogre, Ooze, Orb, Orc, Orgg, Ouphe, Ox, Oyster, Paladin, Paratrooper, Pegasus, Penguin, Pentavite, People-of-the-Woods, Pest, Phantasm, Phelddagrif, Phoenix, Pig, Pikemen, Pincher, Pirate, Pixie-Queen, Plant, Poison-Snake, Poltergeist, Pony, Preacher, Priest, Prism, Pyknite, Rabbit, Raider, Ranger, Rat, Rebel, Reflection, Rhino, Rigger, Robber, Roc, Rock-Sled, Rogue, Sage, Salamander, Samurai, Sand, Saproling, Satyr, Scavenger, Scorpion, Scout, Serf, Serpent, Shade, Shaman, Shapeshifter, Shark, Sheep, Ship, Shyft, Singing-Tree, Sister, Skeleton, Slith, Sliver, Slug, Smith, Snake, Soldier, Soltari, Sorceress, Spawn, Speaker, Specter, Spellshaper, Sphinx, Spider, Spike, Spirit, Splinter, Sponge, Spuzzem, Spy, Squirrel, Stangg-Twin, Starfish, Strider, Survivor, Swarm, Tactician, Tarpan, Teddy, Tetravite, Thief, The-Biggest-Baddest-Nastiest-Scariest-Creature-You'll-Ever-See, Thopter, Thrull, Tiger, Titan, Toad, Tortoise, Townsfolk, Tracker, Treefolk, Triskelavite, Troll, Turtle, Twin, Unicorn, Vampire, Vedalken, Viashino, Villain, Viper, Volver, Vulture, Waiter, Walking-Dead, Wall, War-Rider, Warrior, Weird, Whale, Whippoorwill, Wight, Wiitigo, Wirefly, Witch, Wizard, Wolf, Wolverine, Wolverine-Pack, Wolves-of-the-Hunt, Wombat, Worm, Wraith, Wretched, Wurm, Yeti, Zombie, Zubera

Cumulative Upkeep

Cumulative upkeep is a triggered ability that imposes an increasing cost on a permanent. "Cumulative upkeep [cost]" means "At the beginning of your upkeep, put an age counter on this permanent, then sacrifice this permanent unless you pay [cost] for each age counter on it." If [cost] has choices associated with it, each choice is made separately for each age counter, then either the entire set of costs is paid, or none of them are paid. Partial payments aren't allowed. Note that if a permanent has more than one instance of cumulative upkeep, each creates a separate triggered ability at the beginning of upkeep that counts all the age counters on the permanent from all abilities. See rule 502.13, "Cumulative Upkeep."