The massive card flow that people want for free in Commander and multiplayer lead them to attack each other, but not you, especially since they don't have to spend a card to get the card draw, so for them, this is free card advantage over time for each foe that attacks each other, and you'll draw more than the card it took to cast him in one or two turns
If you have the persist creature Murderous Redcap, you can kill it and bring it back with Celes over and over again to deal a loop of infinite damage to your opponents
No, transforming a card isnt the same as turning it face up or face down
Special Summon from your Extra Deck, 1 "K9" Xyz Monster with a different name, by using that monster you control (this is treated as an Xyz Summon, transfer its materials to the Summoned monster)
Thats good enough to hang around the bottom of this list, and its only up from here