Prismatic Tortoise

Hexproof from monocolored.
Whenever you cast a multicolored spell, put a +1/+1 counter on Prismatic Tortoise.

{1}, Remove a +1/+1 counter: Choose one —
• Prismatic Tortoise gains flying until end of turn.
• Prevent all damage that would be dealt to it this turn.
• Draw a card, then discard a card.