Sea Serpent

Enchant creature (Target a creature as you cast this. This card enters attached to that creature.) Enchanted creature gets +0/+2 and has reach. (It can block creatures with flying.)

4, T: Draw a card.

Flying (This creature can't be blocked except by creatures with flying or reach.)

Whenever this creature blocks or becomes blocked by a non-Wall creature, destroy that creature at end of combat.

(T: Add G.)

Flying R: This creature gets +1/+0 until end of turn.

Flying T: Add one mana of any color.