Shield Trigger

Shield Trigger is evergreen keyword shared among each of the 5 monocolored civilizations.

Details
While the ability was originally featured only on spells, it was later introduced on creatures in DM-04. It enables a spell to be cast or a creature to be summoned for no cost if they are returned to your hand while previously a shield in your shield zone. This enables a game to easily be reversed with a card, such as a DNA Spark disabling any more of your opponent's creatures from attacking and also disabling the opponent's creatures from the battle zone from blocking your next attack, or a Terror Pit removing your opponent's major threat, such as a fatty creature.

Cards with the shield trigger ability tend to be more expensive in mana cost than their regular counterparts (Such as a creature having a power to cost ratio of 5 to 1000 or a spell costing 6 or 7). Due to this factor, Quasi-Vanilla creatures with Shield Trigger are often considered among one of the worst creatures in the entire game due to them having an heavily imbalanced cost to power ratio as well as bringing no direct advantage other than potentially being summoned for no cost.

As creatures with shield Trigger are being summoned into the battle zone instead of being "put", so if a creature with a ”When you summon this creature” effect is put into the battle zone via Shield Trigger, the effect will trigger.
 * A creature such as Heavy Death Metal, End of the Century which can only be summoned can be put into the battle zone like normal this way. Vice Versa, if an ability prevents you from summoning a creature or casting a spell, you can't use the shield trigger abilities of those respective card types.

Reminder Text
The latest reminder text for creatures that have Shield Trigger reads;

The latest reminder text for spells that have Shield Trigger reads;

Example
 Holy Awe
 * Light/Spell
 * 6
 * [[file:shieldtrigger.jpg]] Shield trigger (When this spell is put into your hand from your shield zone, you may cast it immediately for no cost.)
 * Tap all your opponent's creatures in the battle zone.

Cards with the Shield Trigger ability
Creatures
 * -|Light=
 * -|Water=
 * -|Darkness=
 * -|Fire=
 * -|Nature=
 * -|Multicolored=

Spells
 * -|Light=
 * -|Water=
 * -|Darkness=
 * -|Fire=
 * -|Nature=
 * -|Multicolored=

Rulings

 * Q: S・トリガーはどうやって使えばいいのですか/
 * A: シールドがブレイクされると、そのシールドのカｰドはその持ち主の手札に戻りますが、そのカードがS・トリガーだったとき、コストを払わないで、すぐに使えます.
 * Q: S・トリガー能力付きクリｰチャｰはどう使えばいいのですか?
 * A: 呪文もクリｰチャｰも上の説明のように使います. クリｰチャｰの場合は、コストを払わずに召喚する形になります.
 * Q: If O summon a creature with Shield Trigger that has [[file:blockericon.jpg]] Blocker, Can that creature block at that turn?
 * A: Yes. Blocking isn't affected by Summoning Sickness.
 * Q: If a creature can attack untapped creatures, can it attack a creature that is summoned by Shield Trigger?
 * A: Yes, a creature summoned by Shield Trigger is just like any other creature.

Related Categories

 * For cards that give your shields the Shield Trigger ability, see here.