Lessa, Water God

+3: When you attack with blue mana creature, Lessa gives +2/+2 for all other blue mana creatures you control.
-2: After you end step, you may untap all mana, play one land, do a main phase, and do a combat phase. You can only do this once per turn.
-7: If a blue creature dies, you gain seven life for yourself and this planeswalker. You may cast this ability as if it had flash.