If it was properly summoned by Synchro Summon, then yes, it can be brought back, assuming it has no other restrictions.
That means if it got to the graveyard in any other way (ie, tried to Synchro Summon, but it was negated, or it was 'only' special summoned by Vayu, or was sent there by Gale Dogra), then it can't be reborn.
Yes, unless the Synchro Monster is removed from play, negates spell cards that target it, etc.
Almost all Synchro Monsters specify "One Tuner + one or more non-Tuner monsters" or similar. However XX-Saber Gottoms does not, as well as a Tuner, he just requires Earth monsters as components, these can be Earth attribute Tuners if you wish. Also, Red Nova Dragon has two tuners as a requirement.
Currently, no Synchro monster has a negative level.
yes, junk synchron only affects monsters on the field. synchro fusionist activates in the graveyard.
An accel synchro summon works when you tuner your synchro monsters with a synchro tuner monster, creating a more powerful monster. There is only one of these monsters (as of December 13, 2009) that exists. But the number will grow. Hope this helps! :) A second form of an accel synchro summon works is when you have a synchro monster, you can use two tuner monster to accel synchro it or in other words double tuner your monster to form a new one stronger version of it.
Yes, unless the Synchro Monster is removed from play, negates spell cards that target it, etc.
As long as the Synhro Monster can be reborn, and was summoned correctly, then there is no strict limit, you can keep resummoning it as long as you have cards or effects that can do so.
As long as that Stardust Dragon had been special summoned properly by Synchro Summon (ie, it did not reach the field via Starlight Road), then the opponent is free to Monster Reborn it before it tries to special summon itself in the end phase.
Synchro monsters are indeed powerful, but just remember they are just like any other monster card. The best way to defeat many of them is to use cards that remove them from play or send them back into the Extra Deck. Destroying and sending them to the Graveyard is not always the best option since:"Stardust Dragon", a popular Synchro monster, can negate cards that destroy like "Mirror Force", so "Dimmensional Prison" is recommended since it doesn't destroy; it just removes from play.Even if you have a strong monster, "Colossal Fighter", another popular Synchro, can reborn its self again and again if destroyed in battle.And mainly, "Monster Reborn" makes it super easy for them to return. Sure you can "Monster Reborn" the monster yourself, but it's often too risky.If you want to stop Synchro Summoning in the first place, an anti-Special Summon deck is a good idea. Use cards like "Vanity's Fiend", "Royal Oppression", "Fossil Dyna Pachycephalo", and many more.
You are allowed to use Monster Reborn and similar cards, under most circumstances. The important thing is that the Synchro Monster must have been properly special summoned first. If the Synchro Monster ever goes to the graveyard without being properly summoned by Synchro Summon (ie, Starlight Road can do this) then the Synchro Monster cannot be revived like that. Similarly, if a Synchro Monster had its summon negated, it also can't be brought back from the graveyard. Last thing to consider is some might say "cannot be special summoned except by Synchro Summon" meaning the only way to summon it is by Synchro Summon, there is no other way, even if it was properly summoned first.
Almost all Synchro Monsters specify "One Tuner + one or more non-Tuner monsters" or similar. However XX-Saber Gottoms does not, as well as a Tuner, he just requires Earth monsters as components, these can be Earth attribute Tuners if you wish. Also, Red Nova Dragon has two tuners as a requirement.
Currently, no Synchro monster has a negative level.
yes, junk synchron only affects monsters on the field. synchro fusionist activates in the graveyard.
No, Synchro material must be face-up.
the best way is to get the "machine emperor" cards which are a bunch of anti-synchro union cards
No, you do not 'tribute' the Synchro Material for a Synchro Summon. They are sent to the graveyard, not tributed. You can tribute an opponents synchro monster for "Assault Mode Activate!" to summon the assault mode monster from your deck.
No, a Synchro Summon is a kind of Special Summon.