Isoklene, Silver-tongued King

Protection from converted mana cost 2 or less
Whenever an opponent loses life, you may pay {b}{w}. If you do, you gain that much life.
Whenever you gain life, you may pay {w}{u}. If
you do, draw that many cards.
Whenever you one or more cards, you may pay {u}{b}. If you do, target opponent loses life equal
to the number of cards you drew.