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This helps multicolor decks get the best basic land, rather than having to guess on turn one

Once per turn, during damage calculation, when another Defense Position monster you control is attacked by an opponent's monster (Quick Effect): You can activate this effect

Deep-Eyes White Dragon appears as part of Kaiba's deck in Dark Side of Dimensions with the ability to special summon itself if things go wrong

8th structure deck 3.2.4

Simply equip it to any Gusto, then you can use its effect to Special Summon a Gusto with a different Type, or a tuner, from your deck

However, promos don't really fit into the usual rarity ranking system, because a promo's scarcity will depend on how it was given out, and how many copies were distributed