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While Burning Wish is the premier red tutor of all-time, Gamble definitely deserves an honorable mention, particularly for finding Life from the Loam or Sneak Attack

Its the only Green card on this list

However I did draw a hard line around cards which primarily serve to mill your entire deck into your graveyard in one go: Hermit Druid, Cephalid Illusionist, Balustrade Spy, and so on

Colorless commander, toughness-matters, Darksteel Forge for everything

you can just return the cards and get new ones if needed

Meanwhile Coral Colony (and the slightly inferior Doorkeeper) are much easier to work into various decklists as a nice blocker and mana-sink mill source