| Forced |
| Darkness / Creature / 7 |
Demon Command + Hunter / 7000
■ When you put this creature into the battle zone, destroy one of your opponent's creatures.
■ Double breaker (This creature breaks 2 shields.)
| Darkness / Spell / 6 |
■ Destroy one of your opponent's creatures.
If the card is used, certain actions must be used. It usually doesn't matter, but if your opponent was controlling a single creature such as Red ABYTHEN Kaiser in the battle zone, you would be forced to choose it when you put Thunder Blade into the battle zone, and you will lose the cards in your mana zone. Attention should be paid to card abilities that are forced and your opponents cards that have negative results when they are chosen as a target.
- There is a forced "rewind" process at the start of the game, regarding the untap step. If you carelessly forget about it, it rewinds back to that step. This should be avoided in tournament play however, as warnings will be given out.
- If more than one Substitution Effect will replaced the same event, you may choose either. It doesn't matter whether the choice is optional or forced.
If there are multiple substitution effects that can be applied to the same event, but the owner of those cards is different, apply from the active player.
- For example, if you try to break a shield that is fortified by Silver Glory, Invincible Fortress with Bolmeteus Steel Dragon, the substitution effect of Bolmeteus takes precedence and the substitution effect of Silver Glory doesn't apply. Other shields can't be replaced and are put into the graveyard.
When a card "prohibiting an action" and "forcing an action" are simultaneously applied, the prohibition takes precedence.
- Even if you cast Forced Frenzy while Nariel, the Oracle in the battle zone, creatures that have power 3000 or more can't attack.
- If your opponent has Codeking Number Nine in the battle zone, you can't cast spells with Bluum Erkis, Flare Guardian.
It is the opposite of Optional. If a card says "if you do", you may choose not to use an ability.
Awaken ● Battle ● Block ● Break ● Cast ● Charge ● Cross
Destroy ● Discard ● Dragsolution ● Expand ● Forbidden Liberate
Fortify ● Gachinko Judge ● Generate ● Gacharange Summon ● Link ● Reveal ● Seal
Search ● Shuffle ● Summon ● Switch ● Tap ● Trigger ● Upside Down ● Use
Ability ● Artist ● Card Illustration ● Card Name ● Card Number
Card Rarity ● Card Type ● Cost ● Civilization ● Mana Cost ● Mana Number
Power ● Race ● Soul ● Subtype ● Summon Cost ● Supertype
D2 Field ● DG Field ● Dragheart Creature ● Dragheart Fortress ● Dragheart Weapon
Evolution Creature ● Evolution Cross Gear ● Evolution Exile Creature ● Exile Creature
Final Forbidden Creature ● Final Forbidden Field ● Forbidden Core ● Forbidden Creature
Forbidden Field ● Forbidden Impulse ● Gacharange Creature ● Happiness Field
Moonless Night Field ● Neo Creature ● Neo Evolution Creature ● Orega Aura
Psychic Creature ● Psychic Evolution Creature ● Psychic Super Creature ● Twinpact
Ceremony of Zeron ● Zeron Creature ● Zeron Nebula
Super Deck Zero Duel ● Start Deck Champion Finals
Adds Civilization ● Adds Race ● Alternate Win ● Alternative Cost
Attack Bend ● Basic Card ● Cantrip ● Card Discard ● Chump Block
Cost Reduction ● Deck Manipulation ● Degenerate ● Diamond State
Draw Engine ● Draw Lock ● Draw Source ● Draw Spell
Extra Turn ● Finisher ● Graveyard Fertilizer ● Graveyard Summon
Hand Addition ● Hand Change ● Increase Power
Infinite ● Infinite Attacker ● Infinite Blocker
Mana Acceleration ● Mana Burn ● Mana Curve ● Mana Summon
Opponent Reliance ● Peeping ● Prevents Attack ● Prevents Defeat
Reset ● Resistance ● Reverse Fury Charge ● Reverse Slayer ● Shield Addition
Shield Burn ● Shield Change ● Shield Peek
Suicide ● Skip the rest of the turn ● Trample
Unattackable ● Unblockable ● Unchoosable
Vigilance ● Win All Battles ● 3D Dragsolution
Cards that can be put into the Battle Zone at the start of the game
Blocker Based Removal ● Bounce ● Can Attack Untapped Creatures
Card Based Removal ● Decrease Power ● Fixed Removal ● Force Battle ● Mass Removal
Power Based Removal ● Reset ● Sealing ● Self Removal ● Tap In ● Tap and Destroy
4 or more of this card in your deck ● Activation Cost ● Additional Cost ● Attacking Creature
Can't be destroyed ● Choose a race ● Color Accident ● Concept ● Consists of ● Counter
Dead Card ● Deck Building ● Deck Compression ● Designer's Combo ● Evolution Icon
Evolution Source ● Face Up ● Forced ● Gacha Figure ● Game
Game Table ● Key Card ● Limited Card ● Mode ● Name Rule ● Optional ● Overkill
Play ● Power Creep ● Psychic Cost ● Quasi-Vanilla ● Real Cost ● Repair
Rock-Paper-Scissors ● Stop ● System Creature ● The Over Eggplant-cross
Touch ● Trivia card ● Twinpactification