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Sequencing and planning 20 cards ahead all in one turn is a mine field

Declare Blockers Step After you've declared your attackers, your opponent will have the option to block your attackers with any uptapped creatures they have in play

basically, at the end of the duel, sacrifice your master of oz and blue-eyes ultimate dragon to add their attack points to gate guardian, and your attack will reach a whopping 12450 attack

Even better, it has the Hideaway ability, letting you dig five cards deep into your deck and tuck away a spell, ready to cast it for free later when you meet a particular criteria: in this case, having three creatures with different powers after you tap Collector's Cage

Protector of the Throne 31