I am playing rona combo, which involves creating infinite mana via Rona, Herald of Invasion, Mox Amber, Retraction Helix, these 3 cards allow infinite mana. I have prowess creatures on board getting +1/+1 from every single cast thereby changing the boardstate with every cast, I get a warning with "take a different action or a draw occurs" so i cast Stock up and the game ends in a draw, this is literally a different action.

PC

I should be able to continue my loop because i am changing the boardstate with every single cast, and also when i receive the warning I take another action and still result in a draw.