Ruby & Sapphire, Deserters

Starting intensity 0. First Strike.
When Ruby & Sapphire enters the battlefield
and whenever it attacks or block, perpetually
increase its intensity, then choose one:
• Scry 2.
• Discard a card, then draw a card.
When Ruby & Sapphire has intensity 4 or
more: {1}{u}{b}{r}-Transform this card.