Raptor's Ultimate Mace (DOCS-EN055) [Dimension of Chaos]

Equip only to a "Raidraptor" monster. It gains 1000 ATK. When the equipped monster is targeted for an attack by a monster with a higher ATK: You can add 1 "Rank-Up-Magic" Spell Card from your Deck to your hand, and if you do, make the battle damage you take from this battle 0 (even if this card leaves the field).