I'm doing a GPT on Sat. If I do go to the GP, do I have to use the same deck, with the exact same cards? And if I go onto higher events, do I have to have the exact same deck between all the events?
You can change what you play from event to event. You can play a gpt with G/W devotion and then decide to play U/B control for the GP if you want. Registering a deck only matters for that specific event.
So as long as I'm not switching or editing mid event, I'm golden. Cool thank you