| Type | Spell Card |
| Property | Normal |
| Card Effect Type | Card effect |
| Passcode | 60399954 |
Target 1 face-up monster you control; add up the total ATK of all other face-up Attack Position monsters you currently control, then during the Battle Phase of this turn only, the monster gains that much ATK, but cannot inflict battle damage to your opponent, also other face-up Attack Position monsters cannot attack.
| Pack | -- |
|---|---|
| Level-up reward | -- |
| Victory against | Yugi Muto Lvl 30, 40 [SR] |
| Card trader | -- |
| Other | -- |
| Rating | 7.0 /10 |
|---|
A well known popular combo is Gravekeeper's Vassal with 2 monsters with a total attack of at least 4400 ATK to achieve the "Over 5,000 Damage" assessment. As of now, Gravekeeper's Vassal is the only card that has perfect compatibility with Union Attack as it nullifies the drawback effect of Union Attack.
Since this card deals effect damage, it can be used together with Union Attack to deal some damage. Used to farm some LD because it can get a high score quite easily by using 2 monsters with high attack, and end the duel with effect damage ONLY.
If you only have 1 Union Attack, you can use spell reclamation so you can use it twice. This will make it so that you can reach 10,000 damage if your total monster's attack is at least 5,000. If you have 2 union attack, then use 2 instead of this.
Used to special summon high attack fusion monsters, and using less cards than 2 monsters + a Polymerization. Blue-Eyes Ultimate Dragon or Master of Oz are the ones often used together with Vassal and Union Attack.
| LP | Prevents battle damage |
| Stat changes | Your monsters gain ATK |
| Attack categories | Prevents your monsters from attacking |
| SR Rewards | Rating |
|---|---|
 Kuriboh | 5.5/10 |
 Toon Barrel Dragon | 7.5/10 |
 Horn of the Unicorn | 6.0/10 |
 Union Attack | 8.5/10 |
 La Jinn the Mystical Genie of the Lamp | 6.5/10 |
 Precious Cards from Beyond | /10 |
 Milla the Temporal Magician | /10 |
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