1 - If I have a
"Thougt Courier"
(

: Draw a card, then discard a card.)
enchanted with an opponent's
"Betrayal"
(Enchant creature an opponent controls. ; Whenever enchanted creature becomes tapped, you draw a card.)
and tap the creature, who buys first?
2 - If a blocking creature is bounced to hand does the attacker still causes damage? And if the damage is already on stack?
Thanks in advance.