You do need the 4 mana up front, but because it untaps those lands, you can still do stuff with your mana during that turn

Monster 1 card: Ninja of Dusk - Jogen 1 Dusk Ninja - Kagen 1 Yellow Dragon Ninja 1 Ninja General of Dusk - Getsuga 1 sheet Young Ninja 2 Ninja of Guns - Fire Light 3 Ninja Grandmaster Hanzo 1 card Upstart Golden Ninja 2 Ninja of Beasts - Baku 3 Ninjas of Insects - Honey 1 Ninja of the Weight - Magnetic King 1 Karakuri Ninja mdl 339 "Sazank Magic 1 Reinforcements 1 copy Harpie's Feather Duster 2 cards - Ninpo Book of Other Tales 1 piece Hidden Village - Place of Ninpo Training 1 Ninpou Costume - Iron Earthen Dragon 2 cards Heaven, Earth, and New Year's Eve 2 copies Book of Moon 1 copy Sun and Moon Trap 1 Back to the Front 2 cards Ninjitsu Art of Mirage-Transformation 3 Ninjitsu Art of Duplication 2 Ninjitsu Art of Duplication 1 Ninjitsu Art of Super-Transformation Extras 3 cards Ninja of Ebisu - Mei Zen 1 Blade Armor Ninja 2 cards Ninja Grandmaster Saizo 1 Cross-Sheep 1 card Integrity Attitude, Great Insect 1 Card Castel, the Skyblaster Musketeer 1 Gigantic Sprite 2 sheets Armored Ninja - Turumaru 1 Linkuriboh 1 No.2 Mosquitological Ninja - Shadow Mosquito 1 sheet Sprite Elf Ninja Deck 40N #Yu-Gi-Oh

Reprints Classic reprints with fresh foil treatment, not yet numbered
(2025-06-06) Once the number of lore counters on a Saga is greater than or equal to the greatest number among its chapter abilities, the Saga's controller sacrifices it as soon as its chapter ability has left the stack, most likely by resolving or being countered
This is an incredibly classic tempo play