it 's simple 5,6 one tribute 7+ two tributes. As well, because the only two cards that are twelve star that do not go into your extra deck are Yubel: The Ultimate Nightmare and Obelisk the Tormentor (Legal Version), only Obelisk requires three tributes.
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Unless they are monsters that are special summon only, level 7+ monsters require 2 tributes.
You need one tribute for a Lv5 or 6 monster, and two tributes for Lv7+, though many higher level monsters have additional or different requirements.
You need to tribute 2 monsters to summon a Lv7 or more monster, so you need 2 for a 'Blue-Eyes White Dragon'.
Not quite. A Synchro Summon is a Special Summon. A Tribute Summon is the same as a Normal Summon, except that when you Tribute Summon you need to tribute monsters. Also you can Special Summon as many times as you want to in a turn, whereas you can only Normal Summon OR Tribute Summon once per turn, except with a card effect.
You need to tribute one monster for the tribute summon of a Lv5 or 6 monster, and two tributes for any that are Lv7 or higher, even Lv10 ones like Yubel. Additionally, some monsters require three tributes (Obelisk the Tormentor, for example), but that is stated on the card, and it not related to the level.