Bahamut, dragon master

: whenever you cast a dragon, gain 3 life. also, any multicolored dragon or non-red dragon can have it's colored mana substituted for red mana.
+2: transform Bahamut, dragon master into a 5/5 red dragon that's still a planeswalker. he cannot take damage this turn.
-8: deal 5 damage to target player for every dragon, drake, or creature with flying on the battlefield. you can activate this ability any time.