| Type | Spell Card |
| Property | Continuous |
| Card Effect Type | Ignition-like Effect / Condition / Trigger-like Effect |
| Passcode | 73360025 |
| Archetypes | Dark Contract |
| Supports Archetypes | D/D |
| Supports | Fiend / Fusion Monster |
During your Main Phase: You can Fusion Summon 1 Fiend-Type Fusion Monster from your Extra Deck, using monsters from your hand or your side of the field as Fusion Materials. You can only use this effect of "Dark Contract with the Swamp King" once per turn. If Summoning a "D/D" Fusion Monster this way, you can also banish monsters from your Graveyard as Fusion Material. Once per turn, during your Standby Phase: Take 1000 damage.
| Pack | Truth Universe [SR] Selection Box Vol.05 [SR] |
| Level-up reward | -- |
| Victory against | -- |
| Card trader | -- |
| Other | -- |
| Rating | B |
Some D/D/D Fusion monsters allow you some method of avoiding the burn damage of these cards. So these are the monsters you should get on the field first, especially D/D/D Dragonbane King Beowulf which lets you clear your opponent’s backrow.
Emergency Provisions and Contract Laundering can be used just before Dark Contract cards burn you, to instead gain LP. Rainbow Life lets you gain 1000 LP instead of losing it and lets you keep the Dark Contract.
Because Dark Contract with the Swamp King can use monsters from your graveyard as fusion material, milling effects can be used to setup your Fusion Summon. You can also use cards sent to the graveyard for effect costs as fusion material to utilize the resources in your graveyard.
| Actions | Sends from your hand to your Graveyard / Sends from your field to your Graveyard / Fuses Materials from your hand / Fuses Materials from your field / Fuses Materials from your Graveyard |
| Banished categories | Banishes from your Graveyard |
| Summoning categories | Fusion Summons / Special Summons from your Extra Deck |
| LP | Damages you |
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 Cards you should trade |  How to beat the Vegabond |  How to solve Duel Quizes |
| Standard Duelists | ||
|---|---|---|
| Lvl 14 | Lvl 20 | Lvl 27 |
| Lvl 33 | Lvl 39 | Lvl 45 |
| Lvl 51 | Lvl 57 | - |
| Legendary Duelists | ||
| Lvl 30 (DM) | Lvl 30 (GX) | Lvl 30 (5D's) |
D/D/D Dragonbane King Beowulf
D/D/D Oracle King d Arc
D/D/D Wave Oblivion King Caesar Ragnarok
Emergency Provisions
Contract Laundering
Rainbow Life
D/D Swirl Slime
That Grass Looks Greener
Dark Contract with the Witch
