Black Jack the Shadow-Armored Knight

1 Tuner + 1+ non-Tuners
Cannot be destroyed by battle. Each time a card(s) is placed in your opponent's Spell & Trap Zone: Excavate cards from the top of your Deck until you excavate a monster, equip it to this card as an Equip Spell, also place the rest on the bottom of the Deck in any order. Gains ATK/DEF equal to the total Levels of the monsters equipped to this card x 300. If the total Levels of the monsters equipped to this card is greater than 21, destroy this card.