White Tanooki Mario

White Tanooki Mario is a white lucent version of Tanooki Mario.

In Super Mario 3D Land, when Mario loses five lives in a level, an Assist Block containing an Invincibility Leaf will appear. The block emits a tone to alert him of its presence. If Mario takes the Invincibility Leaf, he will become White Tanooki Mario, clad in a white and golden version of the Tanooki Suit. In this form, Mario is permanently invincible until he clears the level. After that, he reverts to regular Tanooki Mario. However, Mario will still lose a life if he falls into a bottomless pit, lava, or purple goo. Unlike in his invincible form, Mario cannot earn lives by defeating enemies. The player cannot obtain this form in levels he has already beaten or in any of the Special Worlds. Because of this, Luigi cannot obtain an Invincibility Leaf unless the player skips a level in a normal world (for example, by using a Warp Zone), or skips one of the optional "black ? block" levels in the first eight worlds.

In New Super Mario Bros. 2, a transformation very similar to White Tanooki Mario known as White Raccoon Mario is present, except it is an invincible form of Raccoon Mario instead of Tanooki Mario.

White Tanooki Mario also appears in Super Mario 3D World. The Invincibility Leaf (now named Invincible Super Leaf) once again causes this transformation. Although the player still must lose five lives in a same course before the power up appears in the single-player mode, the number of lives lost before it appears during the multiplayer mode depends on the number of players (10, 15 and 20 in two, three and four players respectively.)

puzzle and dragons super mario bros edition:
If you have mario on your team and lose 9 live in one attempt at a course, on your last life (when they hit 0) mario will become white tanooki mario, this massively raises your team's attack power, however, he only lasts for the section of the level you are on (once you clear the enemies, he reverts back to whatever form of mario he was before)

Trivia

 * The artwork for White Tanooki Mario for both games is a flipped version of the original artwork.