(You may only have one trigger in a deck. When revealed as a trigger, remove that card, draw a card, choose one of your units, and it gets +100 Million until end of turn! If revealed during drive check, activate its additional effect!)
Additional Effect - Choose one of your rear-guards, and it gets ": At the end of the battle this unit attacked, this unit." until end of turn. If you did not choose a card, draw a card, choose up to one unit card from your hand, and call it to .
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Official Q&A (6)
Q9728 ·
Q. Can I call a unit to a Rear-Guard Circle where a unit is already placed?
A. Yes, you can. In that case, the originally placed unit will be retired.
Q9841 ·
Q. Because "Spiritual King of Ignition, Valnout" was revealed during the drive check, a rear-guard was given "[AUTO][(RC)][1/turn]: At the end of the battle this unit attacked, Stand this unit." At the end of the battle that rear-guard attacked, the granted [Once per turn] AUTOmatic ability triggered. If I don"t want to resolve that ability, can I choose not to resolve it?
A. Yes, it is possible. Limited to [1/turn] Auto abilities, you can choose not to resolve that ability even if the conditions are met. Also, if you choose not to resolve it, it will trigger again if the conditions are met again within the same turn.
Q9840 ·
Q. This is a situation where "Spiritual King of Ignition, Valnout" was revealed during a drive check when you have 0 rear-guards, etc., and no Stand rear-guards exist. After executing the additional effect of "If you did not choose a card, draw a card, and choose up to one unit card from your hand, and call it to (RC)," can you execute "During that turn, Power +100 million"?
A. When performing multiple processes with trigger effects, including additional effects, they can be executed in any order. Also, you can apply "During that turn, Power +100 million" to a unit called to a rear-guard circle due to the additional effect.
Q9839 ·
Q. This is a situation of when "Spiritual King of Ignition, Valnout" is triggered during Drive Check. Even if I have a rear-guard in Stand, and the additional effect of "Choose one of your Stand rear-guards" is activated, can I choose not to select that rear-guard?
A. No, you cannot. If it does not say "up to ~", you have an obligation to choose targets until that number is reached, as long as it is possible to choose them. If it is possible to choose, you cannot choose not to.
Q9838 ·
Q. This is a situation of when "Spiritual King of Ignition, Valnout" is triggered during Drive Check and you have a "Divine Sister, Lepisto" rear-guard in Rest. After resolving the Auto ability of "Divine Sister, Lepisto" that has the condition "When your drive check reveals a trigger unit, " can you choose that Stand "Divine Sister, Lepisto" by executing the "Additional Effect - Choose one of your Stand rear-guards, and it gets ~ "?
A. No, you cannot. After executing the trigger effects, then you resolve Auto abilities that have conditions such as "When your drive check reveals a trigger unit." Therefore, at the point when the trigger effects are executed, you cannot choose the Rest "Divine Sister, Lepsito" with the "Additional Effect - Choose one of your Stand rear-guards, and it gets ~ ".
Q9762 ·
Q. If the cards have different card names, can you include one of each card that has another Over Trigger?
A. No, even if the cards with Over Triggers have different card names, you can only include a total of one in your deck.
Power
Shield
Critical
Over Trigger
Boost
Boost
+100 Million until end of turn! If revealed during drive check, activate its additional effect!)
Additional Effect - Choose one of your 
rear-guards, and it gets "
: At the end of the battle this unit attacked, 
+100 Million until end of turn! If revealed during drive check, activate its additional effect!)
Additional Effect - Choose one of your 
：このユニットがアタックしたバトル終了時、このユニットを
ORR
