Behold, Gate Guardian! (SGX2-ENS04) - Speed Duel GX: Midterm Paradox 1st Edition

Activate this Skill during your Main Phase. Shuffle your entire hand into the Deck, then add 1 Level 11 monster from your Deck to your hand, and if you do, you can Special Summon up to 2 Level 7 monsters with different Attributes from your Deck and/or GY, but their ATK/DEF become 0, also their effects are negated. While you control "Gate Guardian", it gains the following effect.
• Once while face-up on the field, when this card is targeted for an attack: You can change the attacking monster's ATK to 0, until the end of the Damage Step.