Searcher

A Searcher is any card, upon meeting of it's effect requirements (assuming the card has any), that is capable of letting you select monster(s) from your Deck, and either Special Summon it/them to the field, or add it/them to your hand, usually within a restriction placed upon you by the card itself.

Searchers
Searcher Name	Searches...
Special Summons to the Field
Apprentice Magician	Level 2 or lower Spellcaster-Type Monster.
Armed Dragon LV3	1 Armed Dragon LV5.
Armed Dragon LV5	1 Armed Dragon LV7.
Babycerasaurus	1 Level 4 or lower Dinosaur-Type Monster.
Chrysalis Dolphin	1 "Neo-Spacian Aqua Dolphin".
Damage Condenser	1 Monster with ATK equal to or less than Battle Damage you took.
Dark Magic Curtain	1 "Dark Magician".
Des Frog	Any number of "Des Frog"s up to the number of "T.A.D.P.O.L.E."s in the graveyard..
Destiny Hero - Malicious	1 "Destiny Hero - Malicious".
Flying Kamakiri #1	1 Wind-Attribute Monster with 1500 ATK or less.
Giant Germ	Up to 2 more "Giant Germs".
Giant Rat	1 Earth-Attribute Monster with 1500 ATK or less.
Gravekeeper's Spy	1 "Gravekeeper's" Monster with 1500 ATK or less.
Hero Kid	As many "Hero Kids".
Howling Insect	1 Insect-Type Monster with 1500 ATK or less.
Last Will	1 Monster with 1500 ATK or less.
Machine Duplication	Up to 2 Monsters with the same name as a Machine-Type Monster with 500 ATK or less on your side of the field.
Magician's Circle	1 Spellcaster-Type Monster with 2000 ATK or less.
Masked Dragon	1 Dragon-Type Monster with 1500 ATK or less.
Mother Grizzly	1 Water-Attribute Monster with 1500 ATK or less.
Mystic Tomato	1 Dark-Attribute Monster with 1500 ATK or less.
Nova Summoner	1 Light-Attribute Fairy-Type Monster with 1500 ATK or less.
Nimble Momonga	Up to 2 more "Nimble Momongas".
Pyramid Turtle	1 Zombie-Type Monster with 2000 DEF or less.
Sage's Stone	1 "Dark Magician".
Shien's Footsoldier	1 Level 3 or lower "Six Samurai" Monster.
Shining Angel	1 Light-Attribute Monster with 1500 ATK or less.
Troop Dragon	1 "Troop Dragon".
UFOroid	1 Machine-Type Monster with 1500 ATK or less.
UFO Turtle	1 Fire-Attribute Monster with 1500 ATK or less.
Warrior Lady of the Wasteland	1 Earth-Attribute Warrior-Type Monster with 1500 ATK or less.
Places on the Field
Ancient Gear Drill	1 Spell Card
Adds to the hand
Berfomet	A "Gazelle the King of Mythical Beasts".
Birdface	A "Harpie Lady".
D - Time	A "Destiny Hero" Monster.
Different Dimension Capsule	Any card. (As long as this card stays on the field for two turns)
E - Emergency Call	1 "Elemental Hero".
Elemental Hero Stratos	1 "Elemental Hero" or "Destiny Hero" Monster.
Emblem of Dragon Destroyer	1 "Buster Blader".
Gokipon	1 Insect-Type Monster with 1500 ATK or less.
Golden Chest of Sealing	Any card.
King of the Swamp	1 "Polymerization"
Reinforcement of the Army	1 Level 4 or lower Warrior-Type Monster.
Sangan	1 Monster with 1500 ATK or less.
Scarr, Scout of Dark World	1 Level 4 or lower "Dark World monster.
Terraforming	1 Field Spell Card.
Toon Table of Contents	1 card with Toon in its name (or that is named "Manga Ryu-Ran").
Witch of the Black Forest	1 Monster with 1500 DEF or less.