If a monster is set you cannot activate it. "Torrential Tribute" can only activate when any player performs a flip summon, normal summon, Ritual summon, Fusion summon or Special summon, but a set is different from a summon so you cannot activate "Torrential Tribute". The same applies to other cards that activate when a monster is summoned (like "Bottomless Trap Hole" and "Solemn Judgment").
no because it has to be on your side of the field
It just means send a monster from your side of the field to the graveyard
When using metamorphosis the LV of the Fusion monster should be the same as the LV of the monster you are going to tribute.
You have to be summoned by the Ritual Spells to tribute a card in Yugioh Gx Duel Academy.
It requires 1 tribute
After you activate "Heart of the Underdog", you draw a card from your deck like you normally would during your Draw Phase. If that monster you draw happens to be a Normal Monster, you can activate "Heart of the Underdog". You show the Normal Monster to your opponent as proof and draw another card from your deck. If that new card that you draw is a Normal Monster too, you can activate "Heart of the Underdog" again. You repeat the process until you don't draw another Normal Monster.
Double Summon allows you to have an extra Normal Summon. This Normal Summon is no different to your usual once-per turn Normal Summon. If you've got two monsters to tribute, then sure, you can tribute them for an 8-star monster.
It will depend on your style of play but there are cards that are a must in a deck. For me you should have a card that allows you to get or draw a card, eg Pot of Greed, Sangan or Witch of the Dark Forest. also include cards that can destroy your opponents monsters like Torrential Tribute or Lightning Vortex they can really be handy and can save your life.
Because Metalmorph changes the ATK of a monster, it can be activated in the Damage Step. You can therefore do two things. If the defending monster is face-up already, you can activate Metalmorph in response to the attack, that's fine. If the defending monster is face-down, you will flip it at the start of the Damage Step, and can activate Metalmorph as above, before you enter Damage Calculation.
no it is not...
The yugioh card "toon world" does nothing unless you have toon monster cards.Toon world is required for you to activate them and put them into play.
A tribute summon is a form of Normal Summon. So that means you can only tribute summon OR normal summon ONCE per turn.
Assuming the defending monster is also in attack position, both monsters will be destroyed.
You do not remove the counter for the summon, you tribute Ancient Gear Castle itself. So imagine you have Ancient Gear Castle with one counter. You can tribute it for a Lv5/6 Ancient Gear monster - but since Ancient Gear Castle is now gone, it cannot gain another counter.
When a monster attacks a defense position monster with DEF equal to to the attacking monster's ATK, no damage is inflicted to either player's Life Points and no monsters are destroyed in battle. Some monsters have effects that activate before or after they battle, so you must take those into account as well.
magic trap and monster
What's in italics is answering your question. The rest is just other helpful information. Answer from yugioh-card.com: If Ultimate Offering is face-up, you can activate its effect multiple times in the same chain.When you activate Ultimate Offering's effect, you pay the 500 Life Points as a cost at activation, and then the Summon occurs at resolution of Ultimate Offering's effect in that chain. This means that it is possible to Summon a monster in the middle of a chain with Ultimate Offering's effect.If you are using Ultimate Offering's effect to perform a Tribute Summon, you Tribute the monster when Ultimate Offering's effect RESOLVES and you perform the Tribute Summon, NOT when you activate Ultimate Offering's effect and pay the 500 Life Points.If your opponent activates a Trap Card, you can chain the effect of your face-up Ultimate Offering to the Trap Card to Tribute Summon Jinzo (if you had a monster on the field to Tribute) and negate the Trap Card's effect.You cannot flip Ultimate Offering face-up AND use its effect in the same chain; you must have Ultimate Offering face-up on the field before the current chain began.If you activate Ultimate Offering's effect to Summon, and your opponent chains Mystical Space Typhoon to destroy Ultimate Offering, the Summon does not resolve because Ultimate Offering is a Continuous Trap Card and is no longer on the field.You can activate the effect of a face-up "Ultimate Offering" during your Main Phase even if you have not done a Normal Summon yet this turn.
Unless the monster specifically says otherwise, it takes two tributes for a monster of Lv7+
You can, only if something specifically says you can. Tribute for most Ritual Spell Cards can come from hand. But if the card doesn't specify, the tribute must come from your side of the field.