send 1 "Vampire" monster from your Deck to the GY with a different Level, and if you do, the targeted monster becomes the Level of that sent monster in the GY, until the end of this turn
No card surpasses Exodia in terms of guaranteed victory under standard rules
In this case, you can see Amritara in the GY so we can assume that this is the Revolution version
Speed Burn plays cards like Tremendous Fire, Meteor of Destruction, and Dark Room of Nightmare along with some of the other standard Burn choices in order to kill the opponent very quickly, sometimes as early as turn 3
Once you use it, your opponent will find out about its existence, but if you don't get a removal when you find out, it's not scary
Specifically, it prevents your opponent from negating your fusion summons, and makes sure that they cant do anything in response to them being summoned