■ Awaken—When this creature attacks your opponent and isn't blocked, each of your other psychic creatures that cost 5 or less gets "power attacker +2000" and breaks an additional shield until the end of the turn. After the attack, flip this creature to its higher cost side.
In the case of a card in your deck, you may play the card by paying for its Mana Cost in mana during the Main Step.
In the case of a card that starts in your hyperspatial zone, instead of paying mana, you put them into the battle zone by the effect of cards such as Hyperspatial spells. These cards refer to the cost of the card which is known as the Psychic Cost (officially Hyperspatial Cost).
While they are used and described differently, in the text field of a card, they are both collectively expressed as "Cost".
■ Whenever this creature attacks, you may put one of your shields into your graveyard. If you do, destroy one of your opponent's creatures that has power 6000 or less.
In the effect clause of the ability, it is written as "If you do A, do B". If you can't do the A condition, you can't do the B effect.
For example, if you attack with Bolmeteus Musha Dragon but not put any of your shields into your graveyard, you can't destroy any of your opponents creatures.
However, in the case of Volcanic Arrows, "Choose one of your shields and put it into your graveyard." is written as part of a secondary effect, and not as a condition for the first ability. Therefore, it's not treated as a cost and you may remove a creature even if you don't have a shield to remove.
Rules of Cost
In the case of "If C, do D" represented by the "If you do, EFFECT", it is possible to pay the cost assuming that the "If you do" condition was paid. However, if there was even one card corresponding to "C", you won't have paid the cost if you don't use it. For example) If you summon Zeta-File, Zenith of "Mystery", even if you destroy no other creatures, you are still able to reanimate any Demon Commands from your graveyard. If you had any other creatures, you must destroy them in order to reanimate.
When referring to the cost paid by an effect, it isn't possible to refer to the substituted cost. However, if the cost is paid for by destruction, even if the destruction is replaced, it can be counted for abilities that include "for each creature destroyed in this way". For example, if the destruction is replaced with the ability of Perfect Galaxy, Spirit of Immortality when destroyed by Zabi Mira, the Reviving Shaman, you can put out a Psychic Creature.
112.1. There are two types of cost: Mana Cost and Psychic Cost.
112.2. Mana Cost is the amount of mana you need to pay to use the card. This includes the payment of civilization that the card has.
112.2a When paying for a card Mana Cost, make sure to satisfy each of the same civilizations. You must tap at least 1 card of each civilization of that cards respective civilizations in order to pay for that cost. If needed, you need to tap any additional cards (if needed) to pay for the remainder of the cards total cost.
Example: If you are paying for the cost of a Darkness/Fire multicolored card that has a Mana Cost of 4, you must tap a Darkness and Fire card in your mana zone and then tap an additional to cards (regardless of their civilization) to pay the remainder of the cards. Even if you tap a multicolored card that is 2 or more civilizations, it can only contribute 1 civilization per card.
112.2b The Mana required to pay for a card's cost can be increased or decreased by the use of various effects. If the cost of a card falls below the number of civilizations that are required to summon it, the tapping of civilizations is given priority over the cost. For example, if a player has Cocco Lupia (which reduces the cost of a Dragon by 2) on their side of the battle zone and want to summon Perfect Earth, Planetary Dragon (a Dragon with each of the 5 civilizations), they will be required to still tap 5 cards in their mana zone to pay for the civilization requirements of the card regardless of the cost required to summon being reduced to 3.
112.2c If the payment of civilization and the total cost of the card is fulfilled, you can't tap any additional mana.
112.3. There are several abilities that are able to use cards without paying for their mana cost (these cards include "for no cost" in their text).::112.3a ::112.3b ::112.3c ::112.3d
112.3e Even if you use an effect that includes "you may ~, for no cost" in the effect text, the keyword action of "Summon", "Cast" or "Generate" is still performed so any abilities that would trigger from those actions still occur.
112.3f Attack Chance is an ability found on some spells that allows a player to cast a spell without spending its cost under specified conditions.
112.4. Psychic Cost is seen on psychic creatures and draghearts that are played from the hyperspatial zone. It refers to the cost referenced when they are in the zone.
112.5. When in the battle zone, effects that refer to the mana cost of a card refer to Mana cost and Psychic Cost in the same way.
201.1. Cost is a characteristic of a card. A card's cost is usually indicated by a number written in the upper corner.
201.1a The mana cost of a card represents the amount of mana a player must pay to use the card.
201.1b Psychic creatures and draghearts have psychic costs instead of mana costs. Psychic cost cannot be paid with mana.
201.2. When referring to the cost of the card, Mana cost or super We refer to that number regardless of dimension cost.
201.2a The cost of a card always refers to the cost originally written on the card even if an effect modifies the cost of using the card.
Example: The cost of Bolshack NEX is 6 while it is in the battle zone even if there are any Cocco Lupia in the battle zone as well. Therefore, it cannot be destroyed by the effect of Musashi Hall which destroys creatures with cost 4 or less.