Oneshot Effect

Oneshot Effects are an effect that creates a single event that is resolved and is then finished with.

Details
It is the antonym of Continuous Effects.

A oneshot effect is created when a spell is cost or ability resolves. Because a static ability doesn't resolve, it doesn't create a oneshot effect.

An example off a one shot effect includes;
 * Drawing a card from Energy Stream (Resolving a spell)
 * Drawing a card with the ability of Qurian (Resolving the Trigger Ability)

In a situation where a continuous effect prevents an event from occurring, and a oneshot effect would create that event, that event can't be created. For example:
 * When you are prohibited from looking at the contents of your deck by Mestapo, the Patroller, you are unable to look at it by Crystal Memory

In Duel Masters, an ability saying you "can't" perform an action takes priority over an ability telling you to do so.

Substitution effects are not considered a oneshot effect. The substitution effect only creates a continuous situation where one event is replaced by another event.

Other Effects and Abilities
Other Effects
 * Oneshot Effect
 * Continuous Effect
 * Substitution Effect
 * Destruction Replacement effect
 * Sprout
 * Release
 * Madness

Other Abilities
 * Static Ability
 * Trigger Ability
 * Activated Ability
 * Spell Ability
 * Attack Trigger
 * Come Into Play
 * Put Into Graveyard