I have a question. Are you able to flip over Ordeal of a Traveler before your opponent declares an attack, like during their Main Phase? I know it says I cannot activate its effect until they declare an attack, but isn't activating an effect and activating the card different? Also, are you able to use Spell or Trap Cards whenever you want to? In this scenario, my opponent has no monsters on his/her field, but I need to clear out my hand, for example to Special Summon Elemental Hero Bubbleman and activate its ability to draw 2 cards from my Deck. Am I able to just use Lightning Vortex in my hand to discard my extra card just so I can now only hold 1 card in my hand, which would be Elemental Hero Bubbleman? Same goes for if there are no Spell or Trap Cards on the field and I use Heavy Storm.
When I Special Summon Valkyrion the Magna Warrior correctly, then activate its ability to Special Summon Alpha, Beta, and Gamma The Magnet Warrior from my Graveyard am I able to activate Premature Burial or any other recursion card to Special Summon Valkryion back to my side of the field?
Last question, about The Shallow Grave. I think I remember there used to be a ruling some years ago and then it vanished or maybe I was mistaken, but am I able to activate The Shallow Grave if my opponent has no monsters in the Graveyard?
When I Special Summon Valkyrion the Magna Warrior correctly, then activate its ability to Special Summon Alpha, Beta, and Gamma The Magnet Warrior from my Graveyard am I able to activate Premature Burial or any other recursion card to Special Summon Valkryion back to my side of the field?
Last question, about The Shallow Grave. I think I remember there used to be a ruling some years ago and then it vanished or maybe I was mistaken, but am I able to activate The Shallow Grave if my opponent has no monsters in the Graveyard?