You cannot discard your own continuous effect spell/trap card. It must be removed by card effect. Even if it is it's own effect. You can, however, choose not to use its effect. If you choose not to use its effect by not paying its cost, then the card is destroyed. If you choose not to use its optional effect, then it stays on the field until you choose to use it again.
If you have a continuous effect card on the field, chances are that you wanted it there so destroying it yourself is kind of a moot point anyway.
there are continuous trap and spell cards that has no cost for activating. you cannot disregard this effect if you don't destroy the card by another spell or trap card or at some point effects of monster cards. -shar0414-
You can't ever just discard cards for no reason, you can only do so if instructed to by a card effect or a game rule, such as the one that lets you replace one Field Spell Card with another.
You cannot voluntarily just send a card from hand or field to the graveyard for no reason. It can only do so if its text specifically lets you, or you do it for the cost, or by the effect of another card.
No. Dupe Frog triggers only when send from the Field to the graveyard. Also it is an Optional Trigger and would miss the timing anyway.
Yes, they can. You can also play another field spell to remove the one that is currently in effect.
A 'discard' is a type of send, and the card is sent from your hand.
there is no limit
i think u can discard them and yes at some times u can destroy ur own monsters with a trap card
You cannot simply choose to discard a card from hand, voluntarily, or send cards from the field. You can only do so when allowed to do so for a cost, or instructed to by an effect or game mechanic.
Put the cursor over your Speed World 2 that's in your field spell zone then press Activate. Then you can deal 800 damage to your opponent by showing a speed spell in your hand and removing 4 speed counters. If you do the same but remove 7 then you can draw one card, and if you want, remove 10 and destroy a card on the field. Some Speed Spells need you to remove speed counters to activate.
The answer is NO. If there is a cost requiring you to discard a card, you cannot play it. You also can't, for example, play a Card Destruction if there are no cards in either players hand or play Raigeki when your opponent controls no monsters.
yes
You are only allowed 11 cards as a maximum on a field, you have five monster card slots, five spell/trap slots, and a Field Spell Card slot.