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is a strategic trading card game in two players Duel each other using a variety of Monster, Spell, and Trap Cards to defeat their opponent's monsters and be the first to drop the other's Life Points to 0.

BT10-105 C Option Defense Plug-In C Color Black Cost 5 Card Text 1 [Effect] While you have a Tamer in play, you may use this card without meeting its color requirements

(This remains even if this card leaves the field.) Horn of the Phantom Beast X TRAP Target 1 Beast or Beast-Warrior monster you control

That works, but it requires so many clues you wont be able to afford it very often

Even for a relatively simple and un-interactive effect like self-mill, there are a dizzying number of ways to achieve it and all sorts of secondary considerations which might sway you towards one solution over another