Wording on the first two need re-working.
First ability should be until end of turn. 4 mana to give a red creature +0/+3 and shroud, and a blue creature +3/+0, permanently, is nuts. Add on that it's REPEATABLE, and you're fucking insane. Also with the way it's worded, you can target a Red/Blue creature with both abilities; I'm assuming that was intentional.
Second ability should read "Prevent all damage a source of your choice would deal to you this turn. Draw a card for each damage prevented this way." That allows you to do something like, tag a creature, and they can't use it to damage you, like a Tap: do one damage. With the current wording, you'd prevent it, and then draw cards as the ability is resolving. Also, "a source of your choice" is how most of them are worded, because it doesn't target. It can 'choose' things with Shroud, etc.
Third ability is fine.